document.write( "Question 1200692: John is five times as old as his brother. The difference between their age is twelve years. What is John age? \n" ); document.write( "

Algebra.Com's Answer #834883 by Theo(13342) $\"\"$ $\"About$

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j = john's age.
\n" ); document.write( "b = his brother's age.
\n" ); document.write( "j = 5b
\n" ); document.write( "j - b = 12
\n" ); document.write( "replace j with 5 b in the second equation to get:
\n" ); document.write( "5b - b = 12
\n" ); document.write( "combine like terms to get:
\n" ); document.write( "4b = 12
\n" ); document.write( "solve for b to get:
\n" ); document.write( "b = 12/4 = 3
\n" ); document.write( "j = 5b gets you j = 15
\n" ); document.write( "j - b = 12 gets you j - 3 = 12 which gets you j = 3 + 12 which gets you j = 15 again.
\n" ); document.write( "your solution is that john is 15 and his brother is 3.
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