document.write( "Question 1058736: The sum of the present ages of Tahir and Masud is 18 years. Three years ago Tahir was three times as old as Masud. Find their present ages? \n" ); document.write( "
Algebra.Com's Answer #673830 by rothauserc(4718)\"\" \"About 
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Let T be Tahir's age and M be Masud's age
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\n" ); document.write( "1) T + M = 18
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\n" ); document.write( "2) (T-3) = 3 * (M-3)
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\n" ); document.write( "solve equation 1) for T
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\n" ); document.write( "T = 18 - M
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\n" ); document.write( "substitute for T in equation 2)
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\n" ); document.write( "18 - M - 3 = 3M - 9
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\n" ); document.write( "add M to both sides of =
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\n" ); document.write( "15 = 4M - 9
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\n" ); document.write( "add 9 to both sides of =
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\n" ); document.write( "4M = 24
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\n" ); document.write( "M = 6
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\n" ); document.write( "From equation 1) T = 18 - 6 = 12
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\n" ); document.write( "Tahir is 12 years old
\n" ); document.write( "Masud is 6 years old
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