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.

Zoe had 6 songs on her mp3 player . If she deleted 3 old songs from it and then added 20 new songs , how many songs does she have on her mp3 player ?
23

Gwen was organizing her book case making sure each of the shelves had exactly 9 books on it . If she had 3 shelves of mystery books and 5 shelves of picture books , how many books did she have total ?
72

There were 39 girls and 4 boys trying out for the schools basketball team . If only 26 of them got called back , how many students did n't make the cut ?
17