The task is to generate the correct answer for a given math problem.
--------
Question: 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 :

Answer: 60 kg

Question: Problem: the sum of two consecutive numbers is 37 . what are they ?

Answer: 18 and 19

Question: Problem: if x is an integer and 2.13 10 ^ x is less than 2100 , what is the greatest possible value for x ?

Answer:
2