The average weight of 8 friends is 55 kg. One friend weighing 63 kg leaves the group and another weighing 47 kg joins. What is the new average weight?

Explanation

1. 01

   The total falls by $63 - 47 = 16$ kg.

2. 02

   Spread over 8 people, the average falls by $\frac{16}{8} = 2$ kg.

3. 03

   New average = $55 - 2 = 53$ kg.