Multiple choice

The average weight of 18 persons increases by 2.5 kg when a new person comes in place of one of them weighing 72 kg. The weight of the new person is:

  1. 107 kg

  2. 127 kg

  3. 117 kg

  4. 77 kg
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The average weight of 18 persons increases by 2.5 kg. Total increase = 18 × 2.5 = 45 kg. This increase comes from replacing a 72 kg person with the new person. So new person's weight = 72 + 45 = 117 kg. The average increases because the new person is heavier than the person they replaced.

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