document.write( "Question 619064: John bought a number of notepads for $70. Four of the notepads got spoiled. He sold the remaining notepads at $3 more per pad than he paid, and made a total profit of $10. How many notepads did John buy? \n" ); document.write( "

Algebra.Com's Answer #389327 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "John bought a number of notepads for $70. $70/x per pad Four of the notepads got spoiled. 
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document.write( "He sold the remaining notepads at $3 more per pad than he paid, and made a total profit of $10. 
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document.write( "How many notepads did John buy?
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document.write( "   |||Multiplying thru by x so as all denominators = 1
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document.write( "  70(x-4) + 3x(x-4) = 80x
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document.write( "   3x^2 + 58x -200 = 80x
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document.write( "   3x^2 -22x  - 280 = 0
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document.write( "   x = 14, throwing out the negative solution for count
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document.write( "CHECKING our Answer***  70/14 = $5 pd for the notepads originally
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document.write( "  10· $8 - $70 = $10   \n" );
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