Task: Question Answering
Input (English): Problem: the average weight of a, b and c is 60 kg. if the average weight of a and b be 70 kg and that of b and c be 50 kg, then the weight of b is :
Options: a. 50 kg, b. 60 kg, c. 55 kg, d. 57 kg, e. 62 kg
Output (English): b