document.write( "Question 802215: The ratio of boys and girls in a school is 3 : 2 . When 6 more girls join, this ratio becomes 6 : 5 . Then the number of boys in the school is \n" ); document.write( "
Algebra.Com's Answer #483811 by ankor@dixie-net.com(22740)\"\" \"About 
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The ratio of boys and girls in a school is 3 : 2 .
\n" ); document.write( " When 6 more girls join, this ratio becomes 6 : 5 .
\n" ); document.write( " Then the number of boys in the school is
\n" ); document.write( ":
\n" ); document.write( "Let x = the multiplier
\n" ); document.write( "then
\n" ); document.write( "3x = no. boys
\n" ); document.write( "2x = no. of girls originally
\n" ); document.write( ":
\n" ); document.write( "When 6 girls added:
\n" ); document.write( "\"%283x%29%2F%282x%2B6%29\" = \"6%2F5\"
\n" ); document.write( "Cross multiply
\n" ); document.write( "5(3x) = 6(2x+6)
\n" ); document.write( "15x = 12x + 36
\n" ); document.write( "15x - 12x = 36
\n" ); document.write( "3x = 36
\n" ); document.write( "x = 36/3
\n" ); document.write( "x = 12 is the multiplier
\n" ); document.write( "therefore
\n" ); document.write( "3(12) = 36 boys
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check this
\n" ); document.write( "2(12) = 24 girls originally
\n" ); document.write( "then 30 girls when six added
\n" ); document.write( "\"36%2F30\" = \"6%2F5\"
\n" ); document.write( "
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