Primary 6 math problems, kindly please come in to help, there are prizes

7,000 adults, 2,800 children, and 140 disabled people. The specific calculation is as follows: first, calculate the ticket payable by a disabled person after getting on the bus according to the proportion (1 * 1 + 20 * 2 + 50 * 3 = 191 yuan); Divide the total amount of money collected by 191 yuan, and the result is the number of disabled people on the bus (140 people); Finally, the number of disabled persons is multiplied by 20 and 50 respectively to arrive at the number of children and adults.

26740 divided by 71 = one number.

Then 3, 2, 1

The number is the result.

Question 1: Circumference = 2 r, r = 2 .

s=πr²=

v=s*h= * =

w = * 750 = 23550 kg = t (tons).

Question 2: The volume of the original paper v1=s * h = r(large) -r(empty) ]h=[ *2) 2) =( *m

The reduced volume v2=s * h = r (large) -r (empty new) ]h = [ *2) 2) =( *m

Volume reduction = v1-v2 = = m = cm

Question 3: How many cubic meters does it take to build this flower bed? (Keep Integer).

v=[s(large)-s(empty)]*h= [r(large) -r(empty)]h=[2)]=rounded to 2 decimal places) = 2 m (rounded to the nearest integer).

If you plaster cement on the top and outer walls of the flower bed, how many square meters will the area of the plastered cement be? (Keep Integer).

s (outside) = perimeter * height = 2 r * m

s(top) = s great circle -s null = r (large) -r (null) = * m

Total area = s (outside) + s (above) = + m

Rounded to 2 decimal places) = 11 m (rounded to the nearest integer).

It's best to check if there are any miscalculations in between, and the formula and method are correct.

1.(3 x x 750 = 18450 (kg)2.)Original volume of toilet paper: [ 11 2)2 (3 2)2] 12 336

Volume after: [ 11 2)2 (4 2)2] 12 315 Reduced volume: 336 315 21

What is the number? Just multiply it!

The cubic meter of bricks required for the flower bed = * Note: first find the bottom area of the annular flower bed, and then multiply it by the height to obtain the annular volume.

Plastering area = *4 + 5+ Note: The area of the upper edge of the flower bed + the circumference of the bottom of the side multiplied by the height is the area of plastering cement.

The first payment of 72 yuan, according to 9 conversion, the original price is 72 90 80 yuan, 80 72 8 yuan, get the first savings of 8 yuan.

A total of 34 yuan is saved, then 34 8 26 yuan, and the third time to save money and 200 90 180 yuan, so 20 yuan is a 10% discount, 6 yuan is a 20% discount, so the original price is 230 yuan, and the actual payment for the second purchase should be 230 26 204 yuan.

The first time to save 72 * 10% = yuan, the second time to save yuan.

A total discount of 200 yuan within 200 yuan = 20 yuan, enjoy a 20% discount to save yuan, that is, the part exceeding 200 yuan is yuan, so the second purchase of books costs 234 yuan.

Not for the first payment of 72, the original price should be 80, saving 8 yuan, so the second time saving 26 yuan, and buying 200 to save 20, 6 yuan is 20% off the original price should be 230

Therefore, the actual payment for the second purchase of the book by the student is 230-26=204 yuan.