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

Ex Input:
Problem: 10 men and 15 women together can complete a work in 8 days . it takes 100 days for one man alone to complete the same work . how many days will be required for one woman alone to complete the same work ?

Ex Output:
600 day


Ex Input:
Problem: a is twice as good a workman as b and they took 6 days together to do the work b alone can do it in .

Ex Output:
18 days


Ex Input:
Problem: if the product of the integers w , x , y and z is 840 , and if 1 < w < x < y < z , what is the value of w + z ?

Ex Output:

11