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 Q]: There were 150 book shelves . Each book shelf had 15 books . How many books were on the shelves ?
[EX A]: 2250

[EX Q]: The first act included 5 clown mobiles , each stuffed with 28 clowns . How many clowns are inside all the clown mobiles combined ?
[EX A]: 140

[EX Q]: Dana earns $ 13 per hour . She worked 9 hours on Friday , 10 hours on Saturday , and 3 hours on Sunday . How much money did Dana earn in all ?
[EX A]:
286