SOLUTION: Jack has 93 coins. Some are nickels, and some are quarters. He has 16.85. How many of each does he have? Urgent, please assist.

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Question 702412:

Jack has 93 coins. Some are nickels, and some are quarters. He has 16.85. How many of each does he have?
Urgent, please assist.
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
Q+N=93
Q=93-N
.25Q+.05N=16.85
.25(93-N)+.05N=16.85
23.25-.25N+.05N=16.85
-.20N=16.85-23.25
-.20N=-6.40
N=-6.40/-.20
N=32 NICKLES.
Q=93-32=61 QUARTERS.
PROOF:
.25*61+.05*32=16.85
15.25+1.60=16.85
16.85=16.85