Question 46
ProbabilityA bag contains 16 red and 20 blue balls only. How many white balls must be added to the bag so that the probability of randomly picking a red ball is equal to 2/5?
- A.4
- B.20
- C.24
- D.40
Show the answer and explanation
Answer: A (4)
Explanation
We need 16/(36 + w) = 2/5, so 36 + w = 40 and w = 4.