<PRE><B>Question 972980</B>
Q=number of quarters; D=number of dimes
Q+D=38
D=38-Q Use this to substitute for D.
.
$0.25Q+$0.10D=$7.70 Substitute for D.
$0.25Q+$0.10(38-Q)=$7.70
$0.25Q+$3.80-$0.10Q=$7.70
$0.15Q=$3.90
Q=26 ANSWER 1: There are 26 quarters.
D=38-Q=38-26=12 ANSWER 2: There are 12 dimes
.
CHECK:
$0.25Q+$0.10D=$7.70
$0.25(26)+$0.10(12)=$7.70
$6.50+$1.20=$7.70
$7.70=$7.70</PRE>