You are given a math word problem and you are supposed to apply multiple mathematical operators 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.
Example: for a birthday party cody bought 30 regular sodas and 5 diet sodas . if his fridge would only hold 7 on each shelf how many shelves would he fill up ?
Example solution: 5
Example explanation: total sods = 30+5 = 35, total shelves filled = total soda/7 = 35/7 = 5

Problem: lena had some pocket money . she lost $ 4 and her mom gave her $ 9 . if she had $ 66 after that how many dollars did lena have at first ?

Solution: 61