Multiple choice

Five years ago, the average age of A and B was 25. The average age of A, B and C present is 25. Age of C after 5 years will be

  1. 15

  2. 20

  3. 40

  4. 35
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Five years ago, average age of A and B was 25, so their sum was 50. Therefore, current sum of A and B's ages = 50 + 10 = 60. Current average of A, B, C is 25, so current sum = 75. Therefore, C's current age = 75 - 60 = 15. After 5 years, C's age = 15 + 5 = 20.

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