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.

[EX Q]: Mary found 45 seashells , Melanie found 23 seashells , and Jason found 32 seashells on the beach . When they cleaned them , they discovered that 31 were cracked . How many seashells did they find together ?
[EX A]: 100

[EX Q]: Megan was selling her necklaces at a garage sale . She sold 7 bead necklaces and 3 gem stone necklaces . If each necklace cost 9 dollars , how much money did she earn ?
[EX A]: 90

[EX Q]: Rachel was organizing her book case making sure each of the shelves had exactly 9 books on it . If she had 6 shelves of mystery books and 2 shelves of picture books , how many books did she have total ?
[EX A]:
72