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

Ex Input:
Problem: working together , wayne and his son can shovel the entire driveway in three hours . if wayne can shovel six times as fast as his son can , how many hours would it take for his son to shovel the entire driveway on his own ?

Ex Output:
7

Ex Input:
Problem: how many integers between 324,700 and 458,600 have tens digit 1 and units digit 3 ?

Ex Output:
1,33

Ex Input:
Problem: okeydokey paid 5 apples at the apple investment booth for an unopened box of earthworms . artichokey paid 7 apples towards the same lot . the booth pays off earthworms proportional to the apples invested . the box turned out to contain 60 earthworms . how many of them should okeydokey receive ?

Ex Output:
25