The average weight of 5 men is decreased by 3 kg when one of them weighing 150 kg is replaced by

another person. This new person is again replaced by another person whose weight is 30 kg lower

than the person he replaced. What is the overall change in the average due to this dual change?

1.

6 kg

2.

9 kg

3.

12 kg

4.

15 kg

5. 3 kg.