SOLUTION: Your piggy bank has a total of 20 coins in it; some are dimes and some are nickels. If you have a total of $1.25, how many nickels do you have?

Question 536971: Your piggy bank has a total of 20 coins in it; some are dimes and some are nickels. If you have a total of $1.25, how many nickels do you have?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Your piggy bank has a total of 20 coins in it; some are dimes and some are nickels. If you have a total of $1.25, how many nickels do you have?
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Equation:
Quantity: n + d = 20
Value::: 5n+10d = 125 cents
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Multiply thru Quantity by 5:
5n + 5d = 5*20
5n +10d = 125
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Subtract and solve for "d":
5d = 25
d = 5 (# of dimes)
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Solve for "n":
n + d = 20
n + 5 = 20
n = 15 (# of nickels)
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Cheers,
Stan H.
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