John took all of his money out of his savings. He spent $50 on a radio and 3/5 of what remained on presents. Half of what was left he put back in his checking accouny, and the remaining 35.00 he donated to charity. How much money did john originally have in his savings account?

The answer is $225.00

let the amount in his saving be s

: the span $50 on radio; he has $ (s - 50) left

the spent 3/5 (s - 50) on present

he has 2/5 (s - 50) remaining

he kept 1/2 [2/5 (s-50) ]

the remaining is 1/2 [2/5 (s - 50) ] = 35.00

1/5 (s - 50) = 35

s - 50 = 35 * 5

s = 175 + 50

s = 225