A box contains 40 identical discs, some of them being white and the rest blue. If a disc is drawn at random, the probability that it is white is 4/5 .
Question
(a) How many blue discs are there in the box?
(b) How many blue discs should be added into the box to make the probability of drawing a blue disc 1/3?
(c) After removing 2 white and 3 blue discs from the box what will be the probability of drawing a white disc?
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