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WINSTONCH [101]
3 years ago
7

A collection of dimes and nickels is worth $6.60. There are 96 coins in all.

Mathematics
1 answer:
steposvetlana [31]3 years ago
7 0
X - dimes
y - nickels

0.1x+0.05y=6.6\\
x+y=96\\\\
0.1x+0.05y=6.6\\
x=96-y\\\\
0.1(96-y)+0.05y=6.6\\
9.6-0.1y+0.05y=6.6\\
-0.05y=-3\\
y=60\\\\
x=96-60\\
x=36

36 dimes and 60 nickels.
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