Can someone help me?

The heaviest 16% of all men in weight weigh more than how many pounds ?

Hurrya vegetable garden and a surrounding path are shaped like a square that together are 11ft wide. the path is 2ft wide if one bag of gravel covers 9 square feet how many bags are needed to cover the path

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25