algebra

a bank teller has 52 $5 and $10 bills in her cash drawer. the value of the bills is $460. how many $5 bills are there?

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  1. add up the value of the bills:

    5x + 10(52-x) = 460
    5x + 520 - 10x = 460
    5x = 60
    x = 12

    check:
    5(12) + 10(40) = 60 + 400 = 460

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