Question 1009646
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N=number of nickels; D=number of dimes
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N+D=20
N=20-D
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$0.05N+$0.10D=$1.30 Substitute for N from above.
$0.05(20-D)+$0.10D=$1.30
$1.00-$0.05D+$0.10D=$1.30
$0.05D=$0.30
D=6
ANSWER 1: There are 6 dimes.
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N=20-D=20-6=14
ANSWER 2: There are 14 nickels.
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CHECK:
$0.05N+$0.10D=$1.30
$0.05(14)+$0.10(6)=$1.30
$0.70+$0.60=$1.30
$1.30=$1.30
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