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

Sara picked 35 pears and 27 apples from the orchard . She gave 28 pears to Dan . How many pears does Sara have ?
7

Isabella ’ s hair is 18 inches long . If she gets a haircut and now her hair is 9 inches long , how much of Isabella ’ s hair got cut off ?
9

There were 150 book shelves . Each book shelf had 15 books . How many books were on the shelves ?

2250