Multiple choice

The questions given below contain two statements giving certain data. You have to decide whether the data given in the statements are sufficient for answering the question? How old will C be after 15 years? I. 10 years ago, the average age of A and B was 20 years. II. Present average age of A, B and C is 25 years.

  1. If statement I alone is sufficient but statement II alone is not sufficient.

  2. If statement II alone is sufficient but statement I alone is not sufficient.

  3. If each statement alone (either I or II) is sufficient.

  4. If statement I and II together are not sufficient.

  5. If both statements I and II together are sufficient, but neither statement alone is sufficient.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

From I: 10 years ago, (A+B)/2 = 20, so A + B = 40. Currently, A + B = 60. From II: Currently, (A+B+C)/3 = 25, so A + B + C = 75. Therefore C = 75 - 60 = 15. After 15 years, C = 30. Both statements needed - I gives A+B relation, II gives total.

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