document.write( "Question 1152369: Is John is 12 years younger than twice his sister's age and he is sixteen how old is his sister? \n" ); document.write( "
Algebra.Com's Answer #774376 by Theo(13342)\"\" \"About 
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j = john's age.
\n" ); document.write( "s = his sister's age.
\n" ); document.write( "j = 16
\n" ); document.write( "j = 2s - 12
\n" ); document.write( "replace j with 16 to get:
\n" ); document.write( "16 = 2s - 12
\n" ); document.write( "add 12 to both sides of the equation to get:
\n" ); document.write( "28 = 2s
\n" ); document.write( "solve for s to get:
\n" ); document.write( "s = 14
\n" ); document.write( "his sister is 14 years old.
\n" ); document.write( "since 16 = 2 * 14 - 12, the solution is confirmed to be good.
\n" ); document.write( "his sister is 14 years old is the solution.\r
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