These two application questions, 10 points will be awarded for correct answers, and they will never

The first question is relatively simple, just use equations.

The first step, solution: equipped with 40% alcohol solution x kg. Then there is a 30% alcohol solution (x + 4) kg.

40%x=30%（x+4）

x = 12 then there is 16 kg of 30% alcohol solution.

The second step, solution: set to add alcohol x kilograms. (ps: 1-concentration is the water content) 1-30%)*16=(1-50%)*x+16)x=

Answer: Slightly...

Question 2: Solution: Let the speed of the cyclist be a, the distance between the cyclist and A, B and C is s, and the speed of B is x.

24*6=s+6a

19*12=s+12a

Solve a=14 s=200

Then B's velocity can be found.

10x=s+10a

x = 20 Answer: Omitted...

Absolutely original, plus points for the owner of the watchtower. I'm working hard!! I am also a Year 6 student!! Piracy is shameful!!

1. Set the pen element ** as x, the notebook as y, and the teacher has funds a

120x=200y=a

x=a/120

y=a/200

Each set is worth x+y=a 200+a 120=a 75, so you can buy it in total.

a (a 75) = 75 (sets).

75 sets of 2, the west side of point a, the distance is 15-(15+9) 2=3m3, the equation is not in line?

Set up desks for $ x and chairs for $ y.

45x=55y

x+y=200

Solution x=55

y=45 brings a total of 55*45=2745 yuan.

If it's an elementary school.

According to the equation, think about the arithmetic solution

4. Suppose there were m people in the original audience, and the ticket was n after the price reduction

50m*（1+1/5）=n*m*

Get n = 40

The price has been reduced by 50-40 = 10 yuan.

The price of each ticket was reduced by 10 yuan to 40 yuan.

Use the method of drawing the number line, try, and logical reasoning can be based on the skillful basis.

Li 3, Zhao 5, Sun 4 weeks, 5 money.

The number is the age difference between the two people.

So, Li Zhao = 3 , Li Sun = 8 , Li Zhou = 12 , Li Qian = 17, Zhao Sun = 5 , Wang Rui Zhao Zhou = 9, Zhao Qian = 14, Sun Zhou = 4, Sun Qian = 9, Zhou Qian = 5

Total = 3 + 8 + 12 + 17 + 5 + 9 + 14 + 4 + 9 + 5 = 86

If the diameter of the circular spray tank is 4 meters, the radius is 2 meters;

The radius of the guardrail is 2+ meters, then the length of the guardrail is 2 meters;

The area of the circular gravel path is the difference between the areas of two circles, the inner circle is the radius of meters, and the radius of the outer circle is meters; then its area is square meters.

A: The length of the guardrail is meters, and the area of the path is square meters.

The area of the path is 8, and the circumference of the path is calculated by d, multiplied by the width.

The length from the center of the pool to the guardrail is 4 2+, and the circumference is 2 r=5, I don't know which piece of the guardrail is long, anyway, the idea is probably what it means.

If you can leave a gift, divide it into up to 400 portions, one mangosteen, one peach and one apple each.

If all the gifts are used, the greatest common divisor of 400, 480, and 640 is 80, and the maximum number of portions is 80, each with 5 mangosteens, 6 peaches, and 8 apples.

This is a typical problem of finding the greatest common divisor.

How many of the same gifts should be divided into fruits, that is, to find the greatest common divisor of the three numbers 400, 480, and 640.

The greatest common divisor of 400, 480, and 640 is 80, so it can be divided into up to 80 of the same gift.

Of each gift, 5 are mangosteen, 6 are peaches, and 8 are apples.

I don't know how to ask, satisfied, thank you!

Therefore, it can be divided into up to 80 gifts, and each gift includes 5 mangosteens, 6 peaches, and 8 apples.

80 Pieces Each gift has 5 bamboos, 6 peaches, and 8 apples.

Find the greatest common factor.

If the starting interval is equal, the distance between the two cars in front and rear is equal. If the speed of the vehicle is the stool cavity V, the departure interval is t minutes, and the speed of the person is V. After the first car is ushered in front, the second car is in front of the meeting point:

Solution: v = 3v, that is, vehicle speed = 3 times the human speed.

Carry-in: vt (v+v)=6

3vt÷(3v＋v）=6

Solution: t=8

(no matter how little water you have, you have to occupy a cup, so you can't give it up, you can only enter 1) 2, this question is not clear. "Half price for children's tickets, each yuan" is a comma or a full stop in the middle.

If it is a comma indicating that the children's tickets are yuan, then the adult tickets are yuan, and if it is a full stop, then each adult ticket is yuan, and the children's ticket is yuan, at this time, a total of yuan - (yuan.

(km/h.)

5. (cm.)

Work something out. 18 (can only enter 1 can not be rounded) 2, (yuan.

3. meters, square meters.

4. Let Xiao Ming be x years old, 5x+5=75, 5x=70, x=70 5 x=14

5. The price of 6 pants is 360 (1+2)=120 yuan, and the price of the jacket is 120*2=240 yuan.

1:5) 2: Yuan 13x3=39() 39+ 3:

4:66 (km/h 5: (1)1645 18 92() 2) (3) (4)(75-5) 5=14() 5) (6)Solution:

Set pants for x yuan. 2x+x=360 x=120 Top: 2x120=240 () I made it myself, I don't know if it's right, sorry