Multiple choice

The average weight of $5$ children is increased by $2$ kg when one of them who weight $30$kg is replaced by another child.What is the weight of the new entrant

  1. $25$kg
  2. $30$kg
  3. $55$kg
  4. $40$kg
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total weight increase = 5 children * 2 kg = 10 kg. The new child must be 10 kg heavier than the one replaced. New weight = 30 + 10 = 40 kg.

AI explanation

The total weight increase needed to raise the average of 5 children by 2 kg is 5 multiplied by 2, giving 10 kg. When the 30 kg child is replaced, the new child must weigh this extra 10 kg plus the original 30 kg. Therefore, the new entrant weighs 40 kg.