A bag contains 40 balls out of which some are blue and remaining are black. If one ball is picked up randomly then probability of drawing a red ball is 11/20 and that of blue is 1/5 . Find the number of black balls in that bag. Justify your answer
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bag contains 40 balls out of which some are blue and remaining are black. If one ball is picked up randomly then probability of drawing a red ball is 11/20 and that of blue is 1/5 . Find the number of black balls in that bag. Justify your answer
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