Question 919186
Question: After closing down his lemonade stand, David finds that he has 3 and 1/2 times as many dimes as quarters. Their combined value is $15.60. How many dimes does he have?
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Equations:
Quantity:: d = 3.5q
Value:::: 10d + 25q = 1560 cents
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Substitute for "d" and solve for "q"::
10*3.5q + 25q = 1560
35q + 25q = 1560
60q = 1560
q = 26 (# of quarters)
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solve for "d"
d = 3.5q
d = 3.5*26 = 91 (# of dimes)
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Cheers,
Stan H.
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