document.write( "Question 1124730: Erica is 7 years older than Allen. In 5 years' time Erica will be twice as old as Allen. how old is Erica \n" ); document.write( "

Algebra.Com's Answer #741035 by ikleyn(52794) $\"\"$ $\"About$

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document.write( "E = A + 7           (1)     (\"Erica is 7 years older than Allen.\")\r\n" );
document.write( "E + 5 = 2(A+5)      (2)     (\" In 5 years . . . \r\n" );
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document.write( "From eq(1), substitute the expression for E into eq(2). You will get\r\n" );
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document.write( "(A + 7) + 5 = 2*(A+5)\r\n" );
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document.write( "A + 12 = 2A + 10\r\n" );
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document.write( "12 - 10 = 2A - a\r\n" );
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document.write( "2 = A\r\n" );
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document.write( "Answer.  Allen is 2 years old;  Erica is 2 + 7 = 9 years old.\r\n" );
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