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Home Q & A Board Science-Related Homework Help Mathematics
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Flan Flan
wrote...
11 years ago
Algebra
How do I find the # of dimes?
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4 Replies

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wrote...
#1
11 years ago
d = # of dimes
n = # of nickels
d + n = 84
0.1d + 0.05n = 7.15
wrote...
#2
11 years ago
D+N=84
.1D=.05N=7.15
_biology Author
wrote...
#3
11 years ago
.05x + .10(84-x)=7.15
8.4-.10x+.05x=7.15
1.25=.05x
x=25 (.05 pieces)
84-25=59 (.10 pieces)
wrote...
#4
11 years ago
Let X = the number of dimes
therefore, 84 - X = the number of nickles

10X + 5(84-X) = 715
10X + (420 - 5X) = 715
10X - 5X = 715 - 420
5X = 295
X = 59, the number of dimes
(84 - X) = 25, the number of nickles

therefore, you'd have $5.90 worth of dimes and $1.25 worth of nickles.
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