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.
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Question: A toy store had 6 giant stuffed bears in stock when they got another shipment with 18 bears in it . The put the bears onto shelves with 6 on each shelf . How many shelves did they use ?

Answer: 4

Question: Ned bought 14 boxes of chocolate candy and gave 7 to his little brother . If each box has 6 pieces inside it , how many pieces did Ned still have ?

Answer: 42

Question: Mark 's father gave him $ 85 . Mark bought 10 books , each of which cost $ 5 . How much money does Mark have left ?

Answer:
35