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A piggy bank contains only nickels and dimes. In all there are 42 coins with a total value of $3.85. How many nickels are in the piggy bank?
Answered by PsyDAG
Let x = # of nickels, y = # of dimes

x + y = 42

y = 42 - x

5x + 10y = 385

Substitute 42 - x for y.

5x + 10(42-x) = 385

Solve for x.

Answered by edwitch dumerand
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Answered by Anonymous
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