document.write( "Question 733591: two girls' ages, 11 years apart, when multiplied, make 210. The sum of their ages is? \n" ); document.write( "

Algebra.Com's Answer #448485 by josmiceli(19441) $\"\"$ $\"About$

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Let their ages be $\"+x+\"$ and $\"+x+%2B+11+\"$
\n" ); document.write( "given:
\n" ); document.write( " $\"+x%2A%28+x+%2B+11+%29+=+210+\"$
\n" ); document.write( " $\"+x%5E2+%2B+11x+-+210+=+0+\"$
\n" ); document.write( "I notice that $\"+210+=+21%2A10+\"$ and $\"+21+-+10+=+11+\"$
\n" ); document.write( " $\"+%28+x+%2B+21+%29%2A%28+x+-+10+%29+\"$
\n" ); document.write( " $\"+x+=+10+\"$ ( ignore x = -21 )
\n" ); document.write( " $\"+x+%2B+11+=+21+\"$
\n" ); document.write( "The sum of their ages is $\"+21+%2B+10+=+31+\"$ \r
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