The task is to generate the correct answer for a given math problem.
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Question: Problem: the sum of two consecutive numbers is 37 . what are they ?

Answer: 18 and 19


Question: Problem: the total age of a and b is 12 years more than the total age of b and c . c is how many year younger than a

Answer: 12


Question: Problem: if the cost price of 50 articles is equal to the selling price of 20 articles , then the gain or loss percent is ?

Answer:
15