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

Ex Input:
Problem: in a certain country 1 / 5 of 8 = 4 . assuming the same proportion , what would be the value of 1 / 4 of 16 ?

Ex Output:
10


Ex Input:
Problem: a cistern is normally filled in 6 hours but takes two hours longer to fill because of a leak in its bottom . if the cistern is full , the leak will empty it in ?

Ex Output:
24


Ex Input:
Problem: a rectangular field has area equal to 150 sq m and perimeter 50 m . its length and breadth must be ?

Ex Output:

15 m