John saves four times as mary. fred saves half as much as john. together, all three save $280 dollars. how much did each person save? let x = mary’s savings let = john’s savings let = fred’s savings

Mary has 40$, John has 160$, and Fred has 80$. What I did was see how many Mary's money it would take to get 280. John = 4x, and Fred then = 2x. 4x + 2x + x = 7x. Divide 280 by 7 to get 40, which is Mary's savings. Then for John, do 40 times 4, and then 40 times 2 to get Fred's.

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice