document.write( "Question 452838: franklin school has 3 boys for every 4 girls in the 5th grade. there are 140 students in the 5th grade. how many are boys? How many are girls? \n" ); document.write( "

Algebra.Com's Answer #311206 by josmiceli(19441) $\"\"$ $\"About$

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The ratio of boys to girls is $\"+3%2F4+\"$
\n" ); document.write( "Let $\"b\"$ = number of boys
\n" ); document.write( "Let $\"g\"$ = number of girls
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+b+%2B+g+=+140+\"$
\n" ); document.write( "(2) $\"+b%2Fg+=+3%2F4+\"$
\n" ); document.write( "---------------
\n" ); document.write( "(2) $\"+b+=+%283%2F4%29%2Ag+\"$
\n" ); document.write( "Substitute this into (1)
\n" ); document.write( "(1) $\"+%283%2F4%29%2Ag+%2B+g+=+140+\"$
\n" ); document.write( "(1) $\"+3g+%2B+4g+=+560+\"$
\n" ); document.write( "(1) $\"+7g+=+560+\"$
\n" ); document.write( "(1) $\"+g+=+80+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+b+%2B+80+=+140+\"$
\n" ); document.write( "(1) $\"+b+=+60+\"$
\n" ); document.write( "There are 60 boys and 80 girls \n" ); document.write( "

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