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: A waitress put leftover tarts into the fridge on Thursday night . She noticed that the restaurant had 0.08333333333333333 tart filled with cherries , 0.75 tart filled with blueberries , and 0.08333333333333333 tart filled with peaches . How many leftover tarts did the restaurant have in all ?
Example Output: 0.9166666666666666

Example Input: Sara has 31 red and 15 green balloons . Sandy has 24 red balloons . How many red balloons do they have in total ?
Example Output: 55

Example Input: Nell collects baseball cards . She had 304 cards . She gave some of her cards to Jeff and now has 276 cards left . How many cards did Nell give to Jeff ?
Example Output:
28