Primary school application problems, seeking process, a primary school math application problem, sol

Solution: The teacher asked Xiaohu to buy x exercise books and Y pencils. Then there are:

Solution. x=17

y=10Answer: The teacher asked Xiaohu to buy 17 exercise books.

Set exercise book = x and pencil = y

Simultaneous equation: solution: x=17;y=10

Answer: The teacher asked Xiaohu to buy 17 exercise books.

Set exercise book = x and pencil = y

Simultaneous equation: solution: x=17;y=10

The difference between the price of the exercise book and the pencil: yuan).

The difference between the number of exercise books and pencils:

The number of pencils (because there are fewer pencils) :(10-7 * branches) The number of exercise books: 10 + 7 = 17 (books).

Binary equations can be solved! Let the teacher buy the book as x, and buy the pen as yx=17 y=10

The teacher asked me to buy 10 exercise books!

Set up x exercise books and Y pencils.

It's hard to calculate, so let's solve it yourself.

42x3=126

Answer: A certain number is 63, 1, let a certain number be x

x*2/3=42

x=3x42 No answer2=63,1,42*3 2=63,0, a primary school math application problem, solving, to process. Thank you!

Xiao Li did arithmetic, originally wanted to multiply a certain number by 3 and divide it by 2, but because of his carelessness, he mistakenly wrote it as multiplying 2 and dividing it by 3, making the number 42Q: How much is a certain number of whistleblowers?

A wrong question shall not be deducted 9 points and then 3 points will be deducted 12 points, and a wrong question will be deducted 12 points.

The total score was 13 9 117

The demerit is 117 84 33

The number of wrong questions is 33 12 ??

The data in you is wrong?

Xiaolan read a book, read 24 pages on the first day, accounting for 1/5 of the book, and read the whole book on the second day, how many pages did the book read? How many pages are left unread?

I'll help you out.

24 1 5=120 (pages) Answer: There are 120 pages in this book.

120 pages) 120 24 9=87 (pages) Answer: There are 87 pages left unread.

1.Solution: Set the bottom to x decimeters.

1 6x divided by 2 = 3 4

1/6x×1/2=3/4

1/6x=3/2

x=9A: The base of the triangle is 9 decimeters.

Orange juice: 1 6 Sugar: 1 12 Mineral water: 3 4 Orange juice: 180 1 6 = 30 kg Sugar: 180 1 12 = 15 kg Mineral water: 180 3 4 = 135 kg.

A: Orange juice is 30 kg, sugar is 15 kg, mineral water is 135 kg.

3.1800 5 6 = 2160 2160 2 5 = 5400 copies.

A: There are 5,400 books in the library.

4.21 7 16 = 48 48 1 7 = 336 Answer: There are 336 students in the sixth grade.

5. .The formula for the area of the triangle: s=1 2aha=2s h=9

2. According to the title, orange juice, sugar, and mineral water each account for 4 of the drink.

Orange juice: 180 1 6 = 30 kg.

White sugar: 180 1 12 = 15 kg.

Mineral water: 180 3 4 = 135 kg.

3. Number of literary and artistic books: 1800 (5 6) = 2160 books: 2160 2 5 = 5400 books.

4. Class size: 21 7 16 = 48 people.

Number of grades: 48 1 7 = 336.

5. The total amount of water added by Xiao Gang is: 1 2 + 1 3 = 5 6 cups of milk: 1 cup.

So there is a lot of milk.

The first formula for calculating the area of a triangle is to multiply the low by the high divided by two, the area is three-quarters, the height is one-sixth, and if the base of the triangle is x, then one-half (x times one-sixth) is equal to three-quarters, then x is equal to nine.

The total ratio of the second three is 12 orange juice accounts for 2 12 = 1 6 sugar 1 12 mineral water 9 12 3 4 the total is 180 orange juice 1 6x180 = 30 sugar 1 12x180 = 15 mineral water 3 4x180 = 135

The third is to calculate the literature and art books first, and set the literature and art books to have x books: 5 6 times x = 1800 x is equal to 1500 literary and art books, and then calculate all of them, let all of them have y books, 2 5 times y is equal to 1500, and y is equal to 6000, so there are 6000 books in total.

Fourth, the same as above, first calculate how many people are in a class, set 1 class has x people, 7 16 times x equals 21 x equals 48, and then set the whole grade has y people, 1 7 times y equals 48, y equals 338 people, so there are 338 people in the whole grade.

Fifth, I drink a lot of milk, because I drank half a cup at the beginning, and then I drank as much milk as water, so I drank more milk, and I drank half a cup more.

1. s=ah/2

3/4=a*(1/6)*(1/2)

a = (3 4) * 12 = 9 dm.

The base of this triangle is 9 decimeters.

2.Orange juice accounts for 2 12 of the total, sugar accounts for 1 12 of the total, and mineral water points 9 12 of the total

Orange juice = 180 * (2 12) = 30 kg.

White sugar: 180 1 12 = 15 kg.

Mineral water = 180 * (9 12) = 135 kg.

3.Number of literary books: 1800 (5 6) = 2160 books: 2160 2 5 = 5400 books.

4.Class size = 21 (7 16) = 48.

Number of students in all grades = 48 (1 7) = 336.

5.Xiao Gang drank all the milk in the end, so no matter how many times he drank it, he finally drank a glass of milk.

The first time I added 1 2 cups of water, the second time I added 1 3 cups of water, and the total water added was 1 2 + 1 3 = 5 6 cups.

Drink more milk.

The area of a triangle is three-quarters of a square decimeter, its height is one-sixth of a decimeter, what is the base of this triangle?

Divide its area *2 by its height.

That is, (*2) one-sixth = 3

A drink is made from orange juice, sugar, and mineral water on a 2:1:9 basis. If you want to make 180 kilograms of this drink, how many kilograms of orange juice, sugar and mineral water are needed?

That is, the ratio is 2:1:9

180 (2+1+9) to figure out how much is needed for each serving, to get 15

Tangerine juice 15*2=30

White sugar 15*1=15

Mineral water 15*9=135

There are 1,800 scientific and technological books in the library, which is equivalent to five-sixths of the literary and artistic books, and the number of literary and artistic books is equivalent to two-fifths of all the books.

Solution: If there are x cultural books in total, then there are two-fifths x cultural books.

1800 5/6 + 1800 = 2 5x + 1800

x=5400

There are 21 boys in Class 6 (1) of Hope Primary School, accounting for seven-sixteenths of the class, and one-seventh of the class size, how many are there in Grade 6?

21 (7 16) (1 7) = 21 * 16 = 336 people.

It seems like I've done the fifth question before.

Xiao Gang poured a glass of milk, first drank half and filled it with water, then drank a third of it, filled it with water, and finally drank all the drinks, and asked Xiao Gang which one had more milk and water? Why?

There is a total of 1 cup of milk, so the milk you drink is 1 cup.

The first time the water was added 1 2 cups, the second time 1 3 cups were added, for a total of 1 2 + 1 3 = 5 6 cups.

Therefore, drink more milk.

1. The formula for the area of the triangle: s=1 2ah

a=2s/h=9

2. According to the title, orange juice, sugar, and mineral water each account for 4 of the drink.

Orange juice: 180 1 6 = 30 kg.

White sugar: 180 1 12 = 15 kg.

Mineral water: 180 3 4 = 135 kg.

3. Number of literary and artistic books: 1800 (5 6) = 2160 books: 2160 2 5 = 5400 books.

4. Class size: 21 7 16 = 48 people.

Number of grades: 48 1 7 = 336.

5. The total amount of water added by Xiao Gang is: 1 2 + 1 3 = 5 6 cups of milk: 1 cup.

So there is a lot of milk.

1.Triangle area = 1 2 * base * height.

Then the bottom = triangle area * 2 height = (2 * 3 4) (1 6) = 9 dm 3Class size = 21 (7 16) = 48.

All grades = 48 (1 7) = 336 students.

The volume is 8x5x4 = 160 cubic centimeters.

The sum of the volume of water and the cube of iron is cubic centimeters.

140 is greater than 128

There is no water spilling out of the goldfish bowl.

8*5*4=160 box volume.

8*5* volume of water.

2*2*2 8 cube volume.

Will not spill.

The volume of the cube is 2 times 2 times 2 = 8

The remaining volume of the goldfish bowl (multiply 5 times 8 = 20.)

Because 8<20

So the water doesn't overflow.

The volume of the cube iron block is 2*2*2=8 cubic centimeters, and the volume of the cuboid goldfish bowl is 8x5x4=160 cubic centimeters.

The volume of the cube of iron and water is 140 + 8 = 148 cubic centimeters Because the volume of the cube of iron and water (148 cubic centimeters) is smaller than the volume of the cuboid goldfish bowl (160 cubic centimeters), the water does not overflow the goldfish bowl.

Find the volume of water and cube of iron first: cubic centimeters).

Then find the volume of this rectangular fish tank: 8x5x4 = 160 (cubic centimeters) because 148 is less than 160

So no water spills out of the tub.

2*2*2=8 8 (8*5)= 4> so it won't overflow.

Hehe, I think my method should be simpler, right? Count small!

What's the problem? Ask me.

Good luck with your studies!

Solution: 8 5 4 160 (cubic centimeters).

8 5 cubic centimeters).

160 140 20 (cubic centimeters).

No. The volume of water is: 8*5* The volume of the cube is 2*2*2=8, which adds up to 148, and the volume of the tank is 8*5*4=160 148<160 so it won't.

Will not spill. 8*5*( 2*2*2=8 20 is greater than 8 so the water will not overflow!!

Volume of water = cubic centimeters.

Iron block volume = 2x2x2 = 8 cubic centimeters.

Goldfish tank volume = 8x5x4 = 160 cubic centimeters.

So there will be no overflow.

Good luck with your studies!

1. The ratio of A work efficiency to B work efficiency is: A B = 8 6 That is, A work efficiency is 3 4 of B, so the work efficiency of B pumping water into the pool at the same time is (1 + 3 4) B, 6B (1 + 3 4) B = 24 7 hours.

2. Assuming that each pen can be divided into 100%, the total price of 50 pens is 80% off, and in turn, it is equivalent to 80% of each of the 50 pens, then the cheap 6 yuan is 20% of the total price of the remaining 50 pens; The process is: 6 (50-50*80%)=

3. Because the two are moving in opposite directions, the speed is superimposed, and the process is: 750 75 + 50 = 6 minutes.

4. Because chicken + duck = 1500 so duck = 1500 - chicken and because duck * 40% - 1 4 chicken = 15 so (1500 - chicken) * 40% - 1 4 chicken = 15 so chicken is 900 duck is 600