document.write( "Question 1202878: 10 years ago, when Su Lin celebrated her birthday with her family, the ratio of the age of Su Lin to Su Lin's sister was 5 : 7. This year, the ratio of the age of Su Lin to Su Lin's sister is 5 : 6. How old is Su Lin now?\r
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Algebra.Com's Answer #838072 by josgarithmetic(39617) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "               TenYearsAgo      Today\r\n" );
document.write( "SuLin          L-10             L\r\n" );
document.write( "Sister         X-10             X\r\n" );
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document.write( "Ratio         5/7               5/6\r\n" );
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\n" ); document.write( " $\"system%28%28L-10%29%2F%28X-10%29=5%2F7%2CL%2FX=5%2F6%29\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"7%28L-10%29=5%28X-10%29\"$
\n" ); document.write( " $\"7L-70=5X-50\"$
\n" ); document.write( " $\"7L-5X=20\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"L%2FX=5%2F6\"$
\n" ); document.write( " $\"6L=5X\"$ \r
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\n" ); document.write( "\n" ); document.write( "Substitution:
\n" ); document.write( " $\"7L-6L=20\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28L=20%29\"$ -----------Su Lin now. \n" ); document.write( "

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