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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?

  • math -

    Original amount=X Dollars.
    Bought 50 dollar radio.
    (X-50)-3/5*(X-50)=2/5*(X-50) Bal.
    1/2*2/5*(X-50)=1/5*(X-50) Bal.

    1/5*(X-50)=35. Solve for X:
    X=225=Original Amt.

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