document.write( "Question 1089540: Devaughn is 13 years younger than Sydney. The sum of their ages is 75. What is Sydney's age?
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Algebra.Com's Answer #703879 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "You have two equations:\r\n" );
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document.write( "(1)   D = S - 13.\r\n" );
document.write( "(2)   D + S = 75.\r\n" );
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document.write( "Substitute (1) into (2). You will get\r\n" );
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document.write( "(S-13) + S = 75  ====>  2S = 75 + 13 = 88  ====>  S =  = 44.\r\n" );
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document.write( "Answer. Sydney is 44 years old.\r\n" );
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