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:
A worksheet had 3 problems on it . If a teacher had 15 worksheets to grade and had already graded 7 of them , how many more problems does she have to grade ?

Ex Output:
24

Ex Input:
Shirley sold 20 boxes of Do - Si - Dos . How many cases of 4 boxes , plus extra boxes does Shirley need to deliver ?

Ex Output:
5

Ex Input:
Lori has 30 marbles . If she shares them among 5 friends , how many marbles does each friend get ?

Ex Output:
6