SOLUTION: A jar of coins totaling $4.58 contains 13 quarters and 5 nickels. There are twice as many pennies as there are dimes. How many dimes are there?

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Question 757601: A jar of coins totaling $4.58 contains 13 quarters and 5 nickels. There are twice as
many pennies as there are dimes. How many dimes are there?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
p for pennies
n for nickels
d for dimes
c for quarters (because lower Q looks like a 'nine')

c=13, and n=5.
p=2d for "twice as many pennies as dimes".

Account for the money in the jar:
highlight%280.01p%2B0.05n%2B0.10d%2B0.25c=4.58%29
0.01%2A2d%2B0.05%2A5%2B0.1%2Ad%2B0.25%2A13=4.58
0.01%2A2d%2B0.1%2Ad=4.58-0.05%2A5-0.25%2A13
%280.02%2B0.1%29d=4.58-.25-3.25
0.12d=4.58-3.50=1.08
d=1.08%2F0.12
highlight%28d=9%29
and you can use it to find the number of pennies.