document.write( "Question 1087058: Can anyone help me on this question
\n" ); document.write( "A girl is 18 years younger than her mother. in 6 years time the sum of their ages will be 54 how old is girls?
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Algebra.Com's Answer #701343 by josmiceli(19441)\"\" \"About 
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Let \"+g+\" = the girl's age
\n" ); document.write( "Let \"+m+\" = the mother's age
\n" ); document.write( "-------------------------------
\n" ); document.write( "(1) \"+g+=+m+-+18+\"
\n" ); document.write( "(2) \"+%28+g+%2B+6+%29+%2B+%28+m+%2B+6+%29+=+54+\"
\n" ); document.write( "--------------------------------
\n" ); document.write( "(2) \"+g+%2B+m+%2B+12+=+54+\"
\n" ); document.write( "(2) \"+g+%2B+m+=+42+\"
\n" ); document.write( "and
\n" ); document.write( "(1) \"+g+-+m+=+-18+\"
\n" ); document.write( "-----------------------------
\n" ); document.write( "Add (1) and (2)
\n" ); document.write( "(2) \"+g+%2B+m+=+42+\"
\n" ); document.write( "(1) \"+g+-+m+=+-18+\"
\n" ); document.write( "---------------------
\n" ); document.write( "\"+2g+=+24+\"
\n" ); document.write( "\"+g+=+12+\"
\n" ); document.write( "The girl is 12
\n" ); document.write( "----------------------
\n" ); document.write( "check:
\n" ); document.write( "(1) \"+g+=+m+-+18+\"
\n" ); document.write( "(1) \"+12+=+m+-+18+\"
\n" ); document.write( "(1) \"+m+=+30+\"
\n" ); document.write( "and
\n" ); document.write( "(2) \"+g+%2B+m+=+42+\"
\n" ); document.write( "(2) \"+12+%2B+30+=+42+\"
\n" ); document.write( "(2) \"+42+=+42+\"
\n" ); document.write( "OK
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