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)![]() ![]() You can put this solution on YOUR website! 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 \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |