Question 23
ProbabilityA bag contains 21 apples. If 10 apples are green and the rest are red, how many red apples must be added to the bag to make the probability of selecting a red apple 3/5?
- A.8
- B.6
- C.4
- D.2
Show the answer and explanation
Answer: C (4)
Explanation
There are 11 red apples. Adding n red: (11 + n)/(21 + n) = 3/5, so 55 + 5n = 63 + 3n and n = 4.