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July 30, 2015

Homework Help: Algebra

Posted by Mingma Sherpa on Thursday, May 5, 2011 at 6:48pm.

A sack contains yellow marbles and black marbles. If one marble is drawn at random, the probability that it is yellow is 7/8. Six yellow marbles are added to the sack. Now, if one marble is drawn, the probability that it is yellow is 9/10. How many yellow and black marbles were initially in the sack?

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