Math

Peter has 4 more $50 bills than $10 bills in his wallet. If the total amount of money in his wallet is $380, how many $10 bills does Peter have?

I know the answer but I don't know how to set up the equation.

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  1. Let x = # of $50 bills

    Let y = # of $10 bills

    x = 4+y

    50x + 10y = 380

    substitute 4 + y for x

    50(4+y) + 10y = 380
    200 + 50y + 10y = 380
    Solve for y to find # of 10 dollar bills.

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  2. 30

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