document.write( "Question 1189464: A box contains red, blue and green pens. If one pen is chosen at random, the probability that a red pen will be chosen is two times the probability for
\n" ); document.write( "a blue pen and three times the probability for a green pen. If there are 12 red pens in the box, how many pens are in the box?
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Algebra.Com's Answer #820842 by ikleyn(52787) $\"\"$ $\"About$

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document.write( "Let x be the number of pens, in total.\r\n" );
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document.write( "Then the probability to get red pen is ;\r\n" );
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document.write( "and two other probabilities are    and , according to the problem.\r\n" );
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document.write( "The sum of probabilities is 1, so\r\n" );
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document.write( "     +  +  = 1.\r\n" );
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document.write( "It gives  12 + 6 + 4 = x,  hence,  x = 22 :  there are 22 pens, in all.\r\n" );
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