document.write( "Question 799305: Given
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document.write( "Percentage of boys in a class= 70%
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document.write( "number of girls= 540
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document.write( " find the number of boys \n" );
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Algebra.Com's Answer #482584 by thejackal(72) You can put this solution on YOUR website! 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 \n" ); document.write( " |