Question

I don't solve this question please solve this right now​

Answer 1

Answer:

We know that the sum of all probabilities is 1

Thus,

3/10 + 2/5 + x = 1

x = 1 - 7/10

x = 3/10

Thus, probability of getting a red ball is 3/10

Part ii

Black balls = 20

Thus,

20/x = 2/5. (x, here is equal to total no. of balls)

(20*5)/2 = x

Thus,

x = 50

Therefore, the total no. of balls is 50