document.write( "Question 950415: Mary is 12 years and her father is 42 years old\r
\n" ); document.write( "\n" ); document.write( "how old will her father be we he is 4 times as old as mary
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Algebra.Com's Answer #580357 by macston(5194)\"\" \"About 
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M=Mary=F-30; F=Father=M+30;
\n" ); document.write( "F=4M Substitute for M
\n" ); document.write( "F=4(F-30)
\n" ); document.write( "F=4F-120 Subtract F from each side.
\n" ); document.write( "0=3F-120 Add 120 to each side.
\n" ); document.write( "120=3F Divide each side by 3
\n" ); document.write( "40=F
\n" ); document.write( "ANSWER Mary's father was 40 when he was 4 times as old as Mary.\r
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