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: Kaleb had saved up 21 dollars . If he received another 15 dollars for his allowance , how many 6 dollar toys could he buy ?

Answer: 6


Question: A toy store had 4 giant stuffed bears in stock when they got another shipment with 10 bears in it . The put the bears onto shelves with 7 on each shelf . How many shelves did they use ?

Answer: 2


Question: Roger had 25 books . If he sold 21 of them and used the money he earned to buy 30 new books , how many books would Roger have ?

Answer:
34