Question

A bag contains 5 red balls, x blue balls. If the probability of choosing a black ball at random is 9/20.find the value of x

Answer 1

Probability of choosing black ball is 9 out of 20 total balls.

There are 5 red balls and x blue balls.

So,

9 + 5 + x = 20 balls

14 + x = 20 balls

x = 20 - 14

x = 6 balls

x = 6