SOLUTION: frank has 20 coins of nickels and quarters. The value of coins is $3.40. How many of each coins does he have?

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Question 685859: frank has 20 coins of nickels and quarters. The value of coins is $3.40. How many of each coins does he have?
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
Q+N=20
Q=20-N
.25Q+.05N=3.40
.25(20-N)+.05N=3.40
5-.25N+.05N=3.40
-.20N=3.40-5
-.20N=-1.60
N=-1.50/-.20
N=8 NUMBER OF NICKLES.
Q=20-8=12 NUMBER OF QUARTERS.
PROOF:
.25*12+.05*8=3.40
3.00+.40=3.40
3.40=3.40