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

Ex Input:
Problem: find the value of x : 2 x 4 .

Ex Output:
- 2,2

Ex Input:
Problem: each of the products produced yesterday was checked by worker x or worker y . 0.5 % of the products checked by worker x are defective and 0.8 % of the products checked by worker y are defective . if the total defective rate of all the products checked by worker x and worker y is 0.74 % , what fraction of the products was checked by worker y ?

Ex Output:
4 /

Ex Input:
Problem: the average age of 15 students of a class is 16 years . out of these , the average age of 5 students is 14 years and that of the other 9 students is 16 years . tee age of the 15 th student is ?

Ex Output:
26 years