SOLUTION: There are quarters and dimes any piggy bank. The coins are worth $8.50 there are 15 more dimes then there are quarters. How many of each coins are in the piggy bank ?

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Question 1109112: There are quarters and dimes any piggy bank. The coins are worth $8.50 there are 15 more dimes then there are quarters. How many of each coins are in the piggy bank ?
Answer by addingup(3677) About Me  (Show Source):
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d = q+15
0.10d + 0.25q = 8.5
substitute for d:
0.10(q+15) + 0.25q = 8.5
0.10q + 1.5 + 0.25q = 8.5
0.35q = 7
q = 20 there are 20 quarters and
d = q + 15 = 20 + 15 = 35
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Check:
20(0.25) + 35(0.10) = 5 + 3.5 = 8.50 Correct