document.write( "Question 511708: William, who is twelve years old, is four times as old as his brother. How old will William be when he is twice as old as his brother? \n" ); document.write( "
Algebra.Com's Answer #342377 by oberobic(2304)\"\" \"About 
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William = 12 years old
\n" ); document.write( "His brother = 12/4 = 3 years old
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\n" ); document.write( "In the future, William will be 12+x years old, and his brother will be 3+x years old,
\n" ); document.write( "where 'x' is a number of years.
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\n" ); document.write( "At what point will 12+x = 2(3+x)?
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\n" ); document.write( "12 +x = 2(3 +x) = 6 +2x
\n" ); document.write( "-x = -6
\n" ); document.write( "x = 6
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\n" ); document.write( "Answer: In 6 years, William will be twice as old as his brother.
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\n" ); document.write( "Always check your answer.
\n" ); document.write( "12+6 = 18
\n" ); document.write( "3+6 = 9
\n" ); document.write( "18 = 2*9
\n" ); document.write( "Correct
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\n" ); document.write( "Done.
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