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

Ex Input:
Problem: the number of boxes in a warehouse can be divided evenly into 7 equal shipments by boat or 28 equal shipments by truck . what is the smallest number of boxes that could be in the warehouse ?

Ex Output:
28


Ex Input:
Problem: a solution of 70 litres contains oil and water in the ratio 9 : x . if 6 litres of water is added to the solution , the ratio becomes 6 : 4 , find the value of x ?

Ex Output:



Ex Input:
Problem: a square with sides of 15 units each . what would be the area of the square . consider a square as a combination of two right angled triangles .

Ex Output:

225', 'd ) 81', 'e ) 144'