You are given a math word problem and you are supposed to apply multiplication or division mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Ex Input:
Tammy drove 55 miles in one hour . At that rate , how far can she drive in 36 hours ?

Ex Output:
1980

Ex Input:
At lunch a waiter had 9 customers and 5 of them did n't leave a tip . If he got $ 8 each from the ones who did tip , how much money did he earn ?

Ex Output:
32

Ex Input:
A chef needs to cook 15 potatoes . He has already cooked 8 . If each potato takes 9 minutes to cook , how long will it take him to cook the rest ?

Ex Output:
63