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

Example Input: Problem: the total marks obtained by a student in mathematics and physics is 32 and his score in chemistry is 20 marks more than that in physics . find the average marks scored in mathamatics and chemistry together .
Example Output: 26

Example Input: Problem: a retailer buys 80 pens at the market price of 36 pens from a wholesaler , if he sells these pens giving a discount of 1 % , what is the profit % ?
Example Output: 12

Example Input: Problem: on dividing 109 by a number , the quotient is 9 and the remainder is 1 . find the divisor ?
Example Output:
12