Question 985912
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D=number of dimes; N=number of nickels
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D+N=50
D=50-N
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$0.05N+$0.10D=$4.15
$0.05N+$0.10(50-N)=$4.15
$0.05N+$5.00-$0.10N=$4.15
-$0.05N=-$0.85
N=17 ANSWER 1: There were 17 nickels.
D=50-N=50-17=33 ANSWER 2: There were 33 dimes.
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CHECK:
$0.05N+$0.10D=$4.15
$0.05(17)+$0.10(33)=$4.15
$0.85+$3.30=$4.15
$4.15=$4.15