document.write( "Question 989454: fred is 3 times older than his sister Mary, four years ago he was 5 times as old as his sister. find their present ages \n" ); document.write( "
Algebra.Com's Answer #609830 by macston(5194)![]() ![]() You can put this solution on YOUR website! . \n" ); document.write( "M=Mary's age; F=Fred's age=3M \n" ); document.write( ". \n" ); document.write( "F-4=5(M-4) \n" ); document.write( "3M-4=5M-20 \n" ); document.write( "16=2M \n" ); document.write( "M=8 ANSWER 1: Mary is 8 years old. \n" ); document.write( "F=3M=3(8)=24 ANSWER 2: Fred is 24 years old. \n" ); document.write( ". \n" ); document.write( "CHECK: \n" ); document.write( "F-4=5(M-4) \n" ); document.write( "24-4=5(8-4) \n" ); document.write( "20=3(4) \n" ); document.write( "20=20 \n" ); document.write( " |