document.write( "Question 1104156: Don is 5 years older than Peter is. In 5 years, Don will be twice as old as Peter is now. How old is Peter now? \n" ); document.write( "

Algebra.Com's Answer #718885 by ikleyn(52790) $\"\"$ $\"About$

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document.write( "D = P + 5,           (1)     (\"Don is 5 years older than Peter is\")\r\n" );
document.write( "D + 5 = 2*P          (2)     (\"In 5 years, Don will be twice as old as Peter is now.\")\r\n" );
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document.write( "From (1), substitute D = P+5 into equation (2). You will get\r\n" );
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document.write( "(P+5) + 5 = 2*P  ====>  P = 10.\r\n" );
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document.write( "Answer.  Peter is 10 years old.  Don is 10+5 = 15 years old.\r\n" );
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