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.

Example Input: 30 dogs are barking . 10 more dogs start to bark . How many dogs are barking ?
Example Output: 40

Example Input: The school cafeteria ordered 42 red apples and 7 green apples for students lunches . But , if only 9 students wanted fruit , how many extra did the cafeteria end up with ?
Example Output: 40

Example Input: Sandy sold lemonade in her neighborhood . She got 17 half - dollars on Saturday and 6 half - dollars on Sunday . What amount of money did Sandy receive ?
Example Output:
11.5