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

Ex 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 .

Ex Output:
26

Ex Input:
Problem: in a village of 2,500 people , 800 people are over 70 years old and 850 people are female . it is known that 40 percent of the females are younger than 70 years old . if no one in the village is 70 years old , what is the probability that a person chosen at random is either a male or younger than 70 years old ?

Ex Output:
199 / 250

Ex Input:
Problem: an error 1 % in excess is made while measuring the side of a square . the percentage of error in the calculated area of the square is :

Ex Output:
2.01