Correct Answer - Option 3 : 20 kg
Given:
The sum of weights of A and B is 80 kg,
50% of A's weight is 5/6 times the weights of B.
Calculation:
According to the question,
A + B = 80 kg
A × 1/2 = B × 5/6
⇒ A/B = 5/3
8 unit = 80 kg
⇒ 1 unit = 10 kg
Difference = 5 unit - 3 unit = 2 unit = 2 × 10 = 20 kg
∴ The difference between their weights is 20 kg.