document.write( "Question 392153: the ratio of the number of boys to the number of girls in a class was 2:3 at first. after 4 girls left the class, the ratio became 4:5. how many boys were there in the class \n" ); document.write( "

Algebra.Com's Answer #278328 by robertb(5830) $\"\"$ $\"About$

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$\"b%2Fg+=+2%2F3\"$ and $\"b%2F%28g-4%29=4%2F5\"$
\n" ); document.write( "==> $\"b+=+2g%2F3\"$ and $\"b+=+4%28g-4%29%2F5\"$
\n" ); document.write( "==> $\"2g%2F3+=+4%28g-4%29%2F5\"$
\n" ); document.write( "==> 5g = 6g - 24
\n" ); document.write( "==>g = 24, the number of girls, and
\n" ); document.write( "b = 16, the number of boys. \n" ); document.write( "

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