Explanation:

- The average weight of Sohum and his five friends is 48.5 kg.

- This means the total weight of all six people is 48.5 kg x 6 = 291 kg.

- Let the average weight of Sohum's five friends be x kg.

- Therefore, the total weight of the five friends is 5x kg.

- Sohum's weight is x + 3 kg because he weighs 3 kg more than the average of his friends.

- Total weight: 5x + (x + 3) = 291 kg.

- Simplifying, 6x + 3 = 291, which gives 6x = 288, so x = 48 kg.

- Sohum's weight = 48 + 3 = 51 kg.

- Option 1: 51.0 kg is the correct answer.