document.write( "Question 1016501: A box contains 6 white balls, 7 black balls, and 5 red balls. How many red balls must be added to the box so that probability of drawing a red ball is 6/7? \n" ); document.write( "

Algebra.Com's Answer #632889 by macston(5194) $\"\"$ $\"About$

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\n" ); document.write( "x=red balls to add
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\n" ); document.write( " $\"x%2F%286%2B7%2B5%2Bx%29=6%2F7\"$
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\n" ); document.write( " $\"x%2F%2818%2Bx%29=6%2F7\"$ Cross multiply.
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\n" ); document.write( " $\"7x=6%28x%2B18%29\"$
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\n" ); document.write( " $\"7x=6x%2B108\"$
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\n" ); document.write( " $\"x=108\"$
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\n" ); document.write( "ANSWER: Add 108 red balls.
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