SOLUTION: Johnny has a piggy bank containing dimes and quarters. The number of dimes is three less than twice the number of quarters. He has a total of $2.85 in his bank. How many of each ty

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Question 72687: Johnny has a piggy bank containing dimes and quarters. The number of dimes is three less than twice the number of quarters. He has a total of $2.85 in his bank. How many of each type coin is in the bank?
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
D=2Q-3
10(2Q-3)+25Q=285
20Q-30+25Q=285
45Q=285+30
45Q=315
Q=315/45
Q=7 ANSWER FOR THE NUMBER OF QUARTERS
D=2*7-3
D=14-3
D=11 ANSWER FOR THE NUMBER OF DIMES
PROOF
10*11=7*25=285
110+175=285
285=285