SOLUTION: Walter has $7.55 in quarters and dimes. If he has a total of 47 coins, how many are quarters?

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Question 1015071: Walter has $7.55 in quarters and dimes. If he has a total of 47 coins, how many are quarters?
Answer by crabbyoldgamer(13) About Me  (Show Source):
You can put this solution on YOUR website!
q + d = 47

.25q + .1d = 7.55


q = 47-d

.25(47-d) + .1d = 7.55

11.75 - .25d + .1d = 7.55

4.2 = .15d

28=d


q = 47-d = 47-28 = 19