Find two application questions about the ratio, 5 application questions about the ratio, and have an

1.The sum of speeds is 360 4 = 90

The speed ratio is 4:5

Then A velocity = 4 (4+5)*90=40

B speed = 5 (4 + 5) * 90 = 50

2.Suppose the same mass is 1

Then the first piece.

Zinc = 2 (2+5), copper = 5 (2+5).

The second piece. Zinc = 1 (1+3), copper = 3 (1+3) the final alloy.

Zinc: Copper = (2 7 + 1 4) :( 5 7 + 3 4) = (8 + 7) :(20 + 21) = 15:41

1.Speed sum: 360 4 = 90 meters.

4:5 is as: A accounts for 4 9 of the total sum, B accounts for 5 9 of the total sum: 90 * 4 9 = 40 meters.

B: 90*5 9=50 meters.

Answer: The speed of car A is 40 meters, and the speed of car B is 50 meters.

2.The ratio of 2:5 in the first block can be seen as copper 2 7 and zinc 5 7;

The ratio of 1:3 in the second block can be seen as copper occupying: 1 4 and zinc accounting for 3 4;

Suppose a piece has a mass of x:

Copper: Zinc = (2 7 + 1 4) X: (5 7 + 3 4) x Simplification = (2 7 + 1 4) :(5 7 + 3 4) Copper: Zinc = 15:41

Answer: Copper:zinc=15:41

A = (360 4) * 4 9 = 40 km h.

B = (360 4) * 5 9 = 50 km h.

Mass 1 Copper: Zinc = (2 7 + 1 4) :(5 7 + 3 4) = 15:41

Speed and 360 for two 4=90

Because the speed ratio is 4:5

v A = 90 * (4 9) = 40

v B = 50 and set the mass to m

So the total mass of copper is m*(2 7)+m*(1 4)=15m 28 because the total mass after mixing is 2m

So the mass of metallic zinc is 2m-15m 28=41m 28, so the mass ratio is 15:41

The speed of the two cars is 4x and 5x

Then there is: 360=(4x+5x)*4

Get x=10, so the speed of the two cars is 40 and 50 respectively

Let both alloys have a mass a

Then the mass of the first block of copper and zinc is 2a 7 and 5a 7, respectively, and the mass of the second block of copper and zinc is a 4 and 3a 4, respectively

Synthesized copper: Zinc (2a 7+a 4) (5a 7+3a 4).

1。Let the velocity of a be x

then 360 (x+4x 5)=4

The solution is x=40 m-h.

That is, a speed is 40 meters per hour, and B speed is 50 meters per hour.

2.Let the mass of the two alloys be 1

Then zinc alloy copper zinc = (2 7 + 1 4) (5 7 + 3 4) = 15 41

A: 40 meters.

B: 50 m hour.

Set: a piece of mass l

2\7l+1\4l:5\7l+3\4l

Copper: Zinc.

1. It should be 360km apart. The apparent velocity of A is 40 km h, and the velocity of B is 50 km h

1.The ratio of the number of stamps collected by Xiao Ming and Xiao Hong is 5:6, and after Xiao Ming gives Xiao Hong 10 stamps, the ratio of the number of stamps between Xiao Ming and Xiao Hong is 4:

5How many stamps do Xiao Ming and Xiao Hong have?

It turns out that the number of stamps of Xiao Ming is the total number of two people.

5 (5 6) 5 out of 11

Now the number of stamps is the total number of two people.

4 (4 5) 4 out of 9

Xiao Ming and Xiao Hong have a total of stamps.

10 (5/11 4/9) 990 sheets.

2.The ratio of the number of existing plasma TVs to LCD TVs in a shopping mall is 6:5, there are 30 plasma TVs, and how many LCD TVs are there.

30*5 6=25 (sets).

There are 132 students in grades 3 and 6, of which the ratio of male students to female students is 6:5, and male students in 6th grade. How many female students are there?

132 (6 5) 12 people.

Male classmates have. 12 6 72 people.

Female classmates have. 12 5 60 people.

4.The ratio of numbers A to B is 2:3, and the ratio of numbers B to C is 4:5Find the ratio of the number A to the number C.

A:B 2:3 8:12

B: C 4:5 12:15

A:B:C 8:12:15

A: C 8:15

5.The average number of A and B is 25, and the ratio of A to B is 3:5.

The average number of A and B is 25, then the sum is 50, and the ratio of the number A to the number B is 3:5, so A = 3 8 * 50 = 75 4 B = 5 8 * 50 = 125 4

6.For a right-angled triangle, the ratio of the length of the three sides is 3:4:5, and the sum of the two right-angled sides is known to be 5.6

The ratio of the two right-angled sides is 3:4, and the sum is 5.6, so the three sides are ,,, hypotenuse height 2 to obtain the hypotenuse height = 12 25

7.The school bought ***, a total of 980 science and technology books and story books, the ratio of *** to science and technology books is 2:5, the ratio of science and technology books to story books is 5:7, ask how many copies of each of the three books bought?

: Science book: Storybook = 2:5:7 (find the least common multiple of several numbers,)

2+5+7=14 (total portions).

980 14 = 70 copies (per copy).

2*70=140 copies.

Science and technology books 5 * 70 = 350 copies.

Storybook 7*70=490 copies.

8.A, B and C jointly opened a store, with a total principal of 71,500 yuan, the ratio of the principal of A and B is 3:4, and the ratio of B and C is 2:3

A:B:C = 3:4:6

71500 13=5500 yuan (per copy).

A 5500*3=16500 yuan.

B 5500*4=22000 yuan (The idea is the same as the above question, and the simplified method A * B is 3 * 2.)

B * B gets B that is 4 * 2

During the Spring Festival, the school bought chrysanthemums, oranges, and camellia flowers to be used as decorations, chrysanthemums and camellia accounted for one-third and one-quarter of the total respectively, and the rest were oranges, so as to find the ratio of three kinds of bonsai to the total.

Chrysanthemum;One-third = 1;3

Camellias;Quarter = 1;4

Year of orange;1-3/1-4/1=1;5

Who knows?I've graduated!

1.3 liters = ( ) cubic centimeters 2:15 = ( ) hours.

3.If 35 people in the class get it right and 5 people get it wrong, the correct rate is ( ) and the error rate is (back).

The ratio of the most simple integer is ( ) and the ratio is ( ).

5.Beijing will host the 2008 Olympic Games, and there will be ( ) days in the year 2008.

6.• Charts can clearly represent the number of quantities and accurately reflect the changes in the growth of the numbers.

7.If a=2 3 7, b=2 3 3 5, then the greatest common divisor of a and b is ( ) and the least common multiple is ( ).

8.Cut a steel bar 3 meters long into 4 equal sections, each section is ( ) meters long, and the length of each section is the ( ) of this steel bar

9.In a ratio, the two inner terms are reciprocal to each other, if one outer term is and the other is ( ).

10.Cylinders and cones of equal height have a difference of 6 cubic centimeters in volume, the volume of the cylinder is ( ) cubic centimeters, and the volume of the cone is ( ) cubic centimeters.

11.The sum of the numerator and denominator of a fraction is 25, and to reduce it to the simplest fraction is, this fraction is ( ).

The question should be: 44 percent of the total number of girls at this time.

Then girls are 44% (1-44%) = 11 14 The original ratio of boys to girls is 7:5, then girls are 5 7 = 5 7 boys have 22 (11 14-5 7) = 308 students, and now there are 308 (1-44%) = 550 students.

The question should be: 44 percent of the total number of girls at this time.

At first, the number of girls was 220, and the number of boys was 308, and now there are 550 students participating

That's 44 percent of the total number of boys and girls?? What does this phrase mean? Look at it again, the inscription is done.

The circumference of a rectangular field is 80 meters, and the ratio of length to width is 3 1

How many square meters is the area of this land?

2.The total value of the three batches of goods is 2250 yuan, according to the weight, the ratio of the first batch and the second batch is 1 2, and the ratio of the second batch and the third batch is.

1﹕；According to the unit price, the ratio of the first batch to the second batch is 3 1, the ratio of the second batch to the third batch is 7 3, and the three batches of goods each. How much is it worth?

In a triangle, the ratio of the number of three interior angles is 2:3:5, what is the largest interior angle in this triangle?

An alloy with a copper-to-zinc ratio of 3:4 is needed to make 630 grams of this alloy, how many kilograms of copper and zinc are needed?

5. A potion is made of powder and water according to 1 100, how many kilograms of powder are needed to prepare 5050 kg of this potion?

6. A total of 50 baskets of pears and apples were transported from the fruit store, of which the number of pears in baskets was 2:3 of apples, how many baskets of pears and apples were transported?

7. Use 24 cm of wire to form a right-angled triangle.

The ratio of the length of the three sides of this triangle is 3 4 5, and the hypotenuse of this right triangle.

What is the height of the upper centimeter?

8. Cut a rope 8 meters long into two sections, A and B, how many meters are each of A and B?

9. Cut a rope into two sections, A and B, and know how many meters is the length of section A and how many meters is section B?

10. Cut a rope into two sections, A and B, according to 3 2, it is known that the length of the B section is meters, how many meters is the original length of this rope?

11. Cut a rope into two sections, A and B, and it is known that Section B is shorter than Section A, and how many meters are each of the two sections A and B?

12. The store shipped a batch of washing machines, sold 24 units, the ratio of the number of units sold to the remaining number of units is 3 5, how many washing machines are there in total?

13. The students of the Eagle Holiday Team are divided into 3 groups to collect castor beans, and the work efficiency of the first group, the second group and the third group.

The ratio was 12 to 11 7, and the first group collected 36 kg of castor seeds.

2. How many kilograms of castor beans were collected by each of the third group?

1.When the seventh construction company of Gansu Province built the second phase of the Lanzhou Guofang Department Store, the concrete used was cement, sand and gravel according to 2:3:

5. Formulated. Now to configure 1920 tons of this concrete, how many tons of cement are needed? 2.

Column: The ratio of A and B stamps is 8:5, 1.

A sold 150 sheets, and at this time the two were equal, how many sheets did A and B have? 3. The ratio of willow trees and poplars in the park is 5 3, there are 40 willows and poplars, how many willows and poplars are there? 4. Give 300 apple-shaped Zen fruits to the primary, middle and large classes of the kindergarten according to 4 5 6.

How many apples do you get for each of the Nursery, Nursery, and Kindergarten classes? 5. A potion is made of powder and water according to 1 100, how many kilograms of powder are needed to prepare 5050 kg of this medicine Qingzhao water? 6. A total of 50 baskets of pears and apples were transported from the fruit store, of which the number of pears in the basket was apples, and the number of pears and apples in each basket.

1. There are 83 people in two classes A and B, 86 people in B and C, and 85 people in C and A.

A cow and 4 sheep eat a total of 27 kg of grass a day, 6 cows and 15 sheep eat a total of 90 kg of grass a day, and 1 cow and 1 sheep eat a total of 27 kg of grass a day, how many kg of grass does 1 cow and 1 sheep eat a day?

A basketball and 3 volleyballs share 141 yuan, 5 basketballs and 4 volleyballs share 180 yuan Kai Xun, how much is each basketball and each volleyball?

5. Xiaoqiang buys 5 boxes of sugar, Xiaohong buys 5 boxes of cakes and uses 44 yuan, if Xiaoqiang and Xiaohong exchange a box, then the price of all the items in each talk is equal, a box of sugar, a box of cakes each stares at this little yuan?

6. There are 10 red and black balls, 7 red and white balls, 5 black and white balls, how many balls are there for each of the three types of balls?

1. The ratio of the fare paid by passenger A to the other three is 1:2, that is, the fare paid by passenger A is 1 (1+2)=1 3 for 4 people

The ratio of the fare paid by passenger B to the other three is 1:3, that is, the fare paid by passenger B is 1 (1+3) = 1 4 for 4 people;

The ratio of the fare paid by passenger C to the other three is 1:4, that is, the fare paid by passenger C is 1 (1+4)=1 5;

Passengers A, B, and C have paid a total of the total fare: 1 3 + 1 4 + 1 5 = 47 60;

1-47 60 = 13 60 of the total fare payable by passenger D

4 passengers share taxi fare: 26 13 60=?

2. According to the ratio of time to make a piece of children's clothing, a pair of pants and a top, the ratio of time is 1:2:3, then the time for making a piece of children's clothing is x, then it is 2x for making a pair of pants and 3x for making a top

x*2+2x*3+3x*4=1,, and the solution is x=1 20 substitution.

14x1/20+10x2x1/20+2x3x1/20=2