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

[EX Q]: Charles has 25 Skittles . Diana takes 7 away . How many Skittles will Charles have ?
[EX A]: 18

[EX Q]: Elizabeth went to the salon and had 0.375 inch of hair cut off . The next day she went back and asked for another 0.5 inch to be cut off . How much hair did she have cut off in all ?
[EX A]: 0.875

[EX Q]: Dave was helping the cafeteria workers pick up lunch trays , but he could only carry 9 trays at a time . If he had to pick up 17 trays from one table and 55 trays from another , how many trips will he make ?
[EX A]:
8