Explanation:

- The average weight of A, B, C, D, and E is 48 kg. So, their total weight is 5 * 48 kg = 240 kg.

- The average weight of C and E is 42 kg. Hence, their total weight is 2 * 42 kg = 84 kg.

- The weight of (A + B + D) is 240 kg - 84 kg = 156 kg.

- Adding F, we have A, B, C, D, E, F. The average weight of these 6 is reduced by 2.5 kg to 45.5 kg.

- Thus, the total weight becomes 6 * 45.5 kg = 273 kg.

- The weight of F is 273 kg - 240 kg = 33 kg.

- The average weight of A, B, D, and F is (156 kg + 33 kg) / 4 = 47.25 kg.

Option 3: 47.25 kg