A bag constains white, black and red ba...

A bag constains white, black and red ball only. A ball is draw at random form the bage. If the probability of getting a white balls is `(3)/(10)` and that of a black ball is `(2)/(5)` then find the probability of getting a red ball. If the bag contains 20 black balls, find the total number of balls in the bag.

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