<PRE><B>Question 768265</B>
A hat contains 20 marbles that are blue, red and black. If 6 are blue and the probability of not getting black is 3/5, how many red marbles are there? 
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blue--- 6
blue + red = # not black----(3/5)20 = 12
Therefore # red = 6
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Cheers,
Stan H.
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