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

Ex Input:
Problem: the average weight of a group of boys is 30 kg . after a boy of weight 45 kg joins the group , the average weight of the group goes up by 1 kg . find the number of boys in the group originally ?

Ex Output:
14


Ex Input:
Problem: virginia , adrienne , and dennis have taught history for a combined total of 96 years . if virginia has taught for 9 more years than adrienne and for 12 fewer years than dennis , for how many years has dennis taught ?

Ex Output:
4


Ex Input:
Problem: the diagonal of a cube is 8 √ 3 . find its volume and surface area .

Ex Output:

384', 'c ) 324', 'd ) 344', 'e ) 364'