document.write( "Question 546805: Please help me solve this equation Thank You ~\r
\n" ); document.write( "\n" ); document.write( "The sum of the present ages of Ali and Salimah is 18 years.In 6 years time Ali will be twice as old as Salimah .Find their present ages .
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Algebra.Com's Answer #356095 by Earlsdon(6294)\"\" \"About 
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Let A = Ali's present age and S = Salimah's present age.
\n" ); document.write( "1) A+S = 18 \"The sum of the present ages...is 18 years\".
\n" ); document.write( "2) A+6 = 2(S+6) \"In 6 year's time Ali wil be twice as old as Salimah\".
\n" ); document.write( "Rewrite equation 1) as A = 18-S and substitute into equation 2), then solve for S.
\n" ); document.write( "2a) (18-S)+6 = 2(S+6) Simplify.
\n" ); document.write( "2b) 24-S = 2S+12 Add S to both sides.
\n" ); document.write( "2c) 24 = 3S+12 Subtract 12 from both sides.
\n" ); document.write( "2d) 12 = 3S Now divide by 3.
\n" ); document.write( "2e) S = 4 and A = 18-4 = 14.
\n" ); document.write( "Salimah is 4 years old and Ali is 14 years old.
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