document.write( "Question 1005417: A well known publishing house agreed to sell a stated number of copies of their book for RS 4500. had they sold 5 copies less for same amount they would have received RS 30 more for each copy find the number of copies sold? \n" ); document.write( "

Algebra.Com's Answer #621700 by ikleyn(52807) $\"\"$ $\"About$

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\n" ); document.write( "A well known publishing house agreed to sell a stated number of copies of their book for RS 4500.
\n" ); document.write( "Had they sold 5 copies less for same amount they would have received RS 30 more for each copy. Find the number of copies sold?
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document.write( "Let n = number of copies sold.\r\n" );
document.write( "Then each copy was sold for RS .\r\n" );
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document.write( "Had they sold 5 copies less for the same amount, they would receive RS  for each copy. \r\n" );
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document.write( "According to the condition,\r\n" );
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document.write( " + 30 = .\r\n" );
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document.write( "Solve this equation for n. For it, multiply both sides by n*(n-5). You will get\r\n" );
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document.write( "4500*(n-5) + 30*n*(n-5) = 4500*n.\r\n" );
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document.write( "Simplify, and you will get a quadratic equation\r\n" );
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document.write( " = .\r\n" );
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document.write( "Apply the quadratic formula.\r\n" );
document.write( "The equation has two roots. One root is negative, and it doesn't work. Another root is 30.\r\n" );
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document.write( "So, the number of copies sold is 30.\r\n" );
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document.write( "Please check the solution yourself.\r\n" );
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document.write( "Answer. The number of copies sold is 30.\r\n" );
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