math
posted by jessie .
John took all his money out of his savings account. 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 account, and the remaining $35 he donated to charity. How much money did John originally have in his savings account?

Original amount=X Dollars.
Bought 50 dollar radio.
Bal.=X50
(X50)3/5*(X50)=2/5*(X50) Bal.
1/2*2/5*(X50)=1/5*(X50) Bal.
1/5*(X50)=35. Solve for X:
X=225=Original Amt.