Multiple choice

The average weight of 6 persons decreases by 3 kg when one of them weighing 80 kg is replaced by a new person. The weight (in kg.) of the new person is -

  1. 74

  2. 68

  3. 62

  4. 77

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total weight decreased by 6 × 3 = 18 kg. Since one 80 kg person was replaced, the new person weighs 80 - 18 = 62 kg. The new person's weight causes the average to drop by 3 kg.