Answer:
Given, the probability of getting a white ball \[\Rightarrow P(W)=\frac{3}{10}\] and the probability of getting a black ball \[\Rightarrow P(B)=\frac{2}{5}\] then, the probability of getting a red ball \[\Rightarrow P(R)=1-\frac{3}{10}-\frac{2}{5}=\frac{10-3-4}{10}=\frac{3}{10}\] Now, \[\frac{2}{5}\] of total number of balls \[=20\] Total number of balls \[=\frac{20\times 5}{2}\] \[=50\] Hence, the total no. of balls in the bag is \[50\].
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