document.write( "Question 972980: Nick has $7.70 in quarters and dimes, and the total number of coins is 38. How many quarters and how many dimes? \n" ); document.write( "
Algebra.Com's Answer #595255 by macston(5194) You can put this solution on YOUR website! Q=number of quarters; D=number of dimes \n" ); document.write( "Q+D=38 \n" ); document.write( "D=38-Q Use this to substitute for D. \n" ); document.write( ". \n" ); document.write( "$0.25Q+$0.10D=$7.70 Substitute for D. \n" ); document.write( "$0.25Q+$0.10(38-Q)=$7.70 \n" ); document.write( "$0.25Q+$3.80-$0.10Q=$7.70 \n" ); document.write( "$0.15Q=$3.90 \n" ); document.write( "Q=26 ANSWER 1: There are 26 quarters. \n" ); document.write( "D=38-Q=38-26=12 ANSWER 2: There are 12 dimes \n" ); document.write( ". \n" ); document.write( "CHECK: \n" ); document.write( "$0.25Q+$0.10D=$7.70 \n" ); document.write( "$0.25(26)+$0.10(12)=$7.70 \n" ); document.write( "$6.50+$1.20=$7.70 \n" ); document.write( "$7.70=$7.70 \n" ); document.write( " |