Multiple choice

If average age of P, Q, R and S is 56 years and the total age of P and R is 24 years. Find the average age of Q and R.

  1. 42 years

  2. 21 years

  3. 24 years

  4. Can't be determined

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The average of P, Q, R, S is 56, so their total is 4 × 56 = 224. P + R = 24, so Q + S = 224 - 24 = 200. But we need the average of Q and R, not Q and S. Since we don't know R individually, we cannot determine Q + R. Option D is correct. The question misdirects by giving P + R but asking for Q + R.

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