SOLUTION: A child's piggy bank contains nickels, dimes, and quarters. There are twice as many nickels as dimes and four more quarters than nickels. The total value of all the coins is $9.40.

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Question 474694: A child's piggy bank contains nickels, dimes, and quarters. There are twice as many nickels as dimes and four more quarters than nickels. The total value of all the coins is $9.40. Find the number of each type of coin.
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
nickels=2x dimes
quarters=2x dimes + 4
5n+10d+25q=940
5(2d)+10d+25(2d+4)=940
10d+10d+50d+100=940
70d=840
d=12
n=24
q=28
The bank contains 24 nickels, 12 dimes, and 28 quarters..