Definition: You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
Input: when she came back to her mother she returned $ 27 worth of change . from the initial $ 100 that her mom gave her how much money in total did she spend on buying groceries ?
Output:
73