Ask elementary school students for simple math problems

It takes 24 days for my sister to read the whole book, which means that my sister reads 1/24 every day, and it takes 32 days for my sister to read the whole book, which means that my sister reads 1/32 every day, and divide 4 by (1/24 minus 1/32) to calculate the number of pages of the book, and finally multiply the number of pages by the fraction of my sister's reading every day, and that's it.

4 divided by (1 24-1 32) = 384 (pages).

384 times 1 32 = 12 (pages).

You can't use equations, right, my sister's efficiency is 1 24, and my sister's efficiency is 1 32, that is, my sister reads 1 96 more books a day than my sister

It is known that my sister reads 4 more pages a day than my sister.

4 divided by 1 96 = 384 pages.

384 32 = 12 pages.

First find out how many pages each sister reads in a day, divide 1 by 24 = 1 24, which is the sister's, then divide 1 by 32 = 1 32, which is the sister's, then find out how many pages the sister reads more than the younger sister, use 1 24-1 32 = 1 96, and then find out how many pages the whole book has, 4 divided by 1 96 = 384 (pages), and finally divide 384 by 32 equals 12 pages.

If my sister reads x pages every day, you can column:

x+4) 24=32x, solve x=12, so my sister reads 12 pages a day.

I'm a junior in high school and I'm depressed when I help elementary school students do questions.

Suppose my sister reads x pages a day and my sister reads x-4 every day

24x=32(x-4)

24x=32x-128

8x=128

x=16 sister reads 16-4 12 pages a day.

Solution: Let my sister read x pages every day.

x+4）*24=32x

96=32x-24x

96=8xx=12

A: My sister reads 12 pages a day.

Let's say my sister reads n pages every day.

24(n+4)=32n

n=12

60 5) file shield (high stupid argument 15 5) = 4

4 * 5 (greatest common divisor) = 20

Go to speed 1 5=

The return speed is less than 1.

Six million two hundred seventy two thousand five hundred. Ten thousand.

1. (75) points.

1) hours (25) minutes to instruct the cavity disturbance.

8400) cubic centimeters.

3. (1) hour round bridge.

5, (6072500) (6072500) (10,000) Hengdan. I.

Divide by 7= 571428 loop (followed by all 100 million.)

3. It is one-third of the cuboid and the profit is 500 yuan (if the original price is x 2000, the nine-fold discount is 1800 (1800-x) x = get x = 1500, then the profit will be 2000-1500 = 500 yuan without discount).

5 7 are prime numbers for each other, you just need to find out the prime number field A three games are respectively and B C D one game must only be with A B two games that is with A and can only be D (and C C is two) then D is a game with A and B.

Loop, that is, just click a dot on the two numbers 5 and 8, and the number on the 100th digit is 4.

2. Writing 362000000, is 100 million.

3. It is one-third of the cuboid and the profit is 500 yuan (if the original price is x 2000, the nine-fold discount is 1800 (1800-x) x = get x = 1500, then the profit will be 2000-1500 = 500 yuan without discount).

5 7 are prime numbers for each other, you just need to find out the prime number field A three games are respectively and B C D one game must only be with A B two games that is with A and can only be D (and C C is two) then D is a game with A and B.

One, 4 7 = according to this law cycle, six numbers in a group, 16 groups in a hundred numbers remaining 4, 100 6 = 16 ......4 So the hundredth number is the fourth of the six numbers, it is 4 two, 3620000000 is changed to a number of billions, as long as the decimal point is dotted after the billion, it is 100 million three, because the volume of the cylinder and the cuboid is multiplied by the base area, and the volume of the cylinder is one-third of the cylinder of the same height as it, so it is also one-third of the cuboid of the same height as it The commodity is 2000 90% = 1800 (yuan) after a nine-percent discount, so as to calculate the profit of 1800 20% = 360 (yuan), Then calculate the purchase price of 1800-360 = 1440 (yuan), if according to the original price **, you can make a profit of 2000-1440 = 560 (yuan) Four, 2 and 5 co-quality, 2 and 7 co-quality, 2 and 9 co-quality, 4 and 5 co-quality, 4 and 7 co-quality, 4 and 9 co-quality, 5 and 7 co-quality, 5 and 9 co-quality, 7 and 9 co-quality, except for two and four, any two numbers are mutually qualitative Fifth, A played three games, indicating that he played one game with three other people, B played with A, and one game was played with one of C. One of C's matches is against A, which means that B is not playing with him, and B is playing with D, and D has played 2 games, one with A and one with B. I'm a newbie, so I hope to give extra points! Thank you!

The commercial cyclic decimal of 4 divided by 7 is expressed as, the number on the hundredth decimal place is 4, and the cyclic stanza of ** is 571428

The remainder of 100 6 is 4, so take the fourth number is 4

362 million is written as 362000000, which is rewritten as 100 million in 100 million.

I haven't practiced for a long time, and I've forgotten all the work forms, so I'm sorry.

Date Income and Expenditure Balance Balance.

Income and expenditure Yuan Balance Yuan.

2300 5760 Do the math yourself.

Hope it helps.

Dad's salary is 6,500 yuan.

Bank mortgage 4500 yuan.

Mother's salary is 5,800 yuan.

Pay utility bills. Management fee, etc. 480 yuan.

It costs 180 yuan to buy a book.

My mother spent 260 yuan to buy clothes.

Dad's bonus is 1,500 yuan.

It costs 320 yuan to go out to play.

This month's food collection used 2,300 yuan.

Date Income and Expenditure Balance Balance.

Income and expenditure Yuan Balance Yuan.

Forget it, let's take a good look!

20:8 = 5:2 (both divided by 4).

36:2 = 18:1 (both divided by 2).

102:68=51:34 (both divided by 2).

1 3:4 5 = 5:12 (both multiplied by 15).

3 7:5 21 = 9:5 (both multiplied by 21).

1 (both multiplied by 4).

5:2 18:1 3:

When I finished it, I remembered again, you said it was very simple, it was all verbal, and you didn't do it yourself.

20:8 is equal to 5:2 by dividing both sides by 4 at the same time according to the nature of the ratio