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OpenStudy (anonymous):
Your piggy bank has a total of 40 coins in it; some are dimes and some are nickels. If you have a total of $3.25, how many dimes do you have?
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hero (hero):
x + y = 40 .05x + .10y = 3.25 y = 40 - x y = (3.25 - .05x)/.10 y = y .10(40 - x) = 3.25 - .05x 4 - .10x = 3.25 - .05x 4 - 3.25 = .05x .75 = .05x x = .75/.05 x = 15 y = 25
hero (hero):
@Luis_Rivera still doesn't work yet
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