Question 1005405
.
N=number of nickels; D=number of dimes
N+D=82
D=82-N
.
$0.05N+$0.10D=$6.65
$0.05N+$0.10(82-N)=$6.65
$0.05N+$8.20-$0.10N=$6.65
-$0.05N=-$1.55
N=31
ANSWER: She had 31 nickels.