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)\"\" \"About 
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\n" ); document.write( "M=Mary's age; F=Fred's age=3M
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\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.
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\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
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