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.

Example Input: A new building needed 14 windows . The builder had already installed 5 of them . If it takes 4 hours to install each window , how long will it take him to install the rest ?
Example Output: 36

Example Input: A waiter had 5 tables he was waiting on , with 5 women and 3 men at each table . How many customers total did the waiter have ?
Example Output: 40

Example Input: Brenda wants to split a collection of erasers into groups of 90 . Brenda has 270 erasers . How many groups will be created ?
Example Output:
3