document.write( "Question 799305: Given
\n" ); document.write( "Percentage of boys in a class= 70%
\n" ); document.write( "number of girls= 540
\n" ); document.write( " find the number of boys
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Algebra.Com's Answer #482584 by thejackal(72)\"\" \"About 
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70% of (boy+girls) = boys\r
\n" ); document.write( "\n" ); document.write( "boy + girls = 100%\r
\n" ); document.write( "\n" ); document.write( "we know boys take 70% of the total which is (boys+girls)\r
\n" ); document.write( "\n" ); document.write( "therefore the remaining 30% must be taken by girls.\r
\n" ); document.write( "\n" ); document.write( "Given girls = 540, then 540/(boys+girls) = 30%
\n" ); document.write( "Make (boys+girls) the unknown and solve for it.
\n" ); document.write( "therefore (boys+girls) = 540/30% = 1800
\n" ); document.write( "since we know number of girls then 1800-girls=boys = 1260
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