I need help with this math problem please

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

Kendra had twice as much money as kareem. kendra later spent $8 and kareem earned $6. by then, the two had the same amount of money. how much money did each have originally?

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.