You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators 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: Mark has 13 trees in his backyard . If he plants 12 more , how many trees will he have ?

Answer: 25

Question: David has 8 bananas . He gets 50 more from Christopher . Later , David buys 9 cards at the store . How many bananas does David have in all ?

Answer: 58

Question: Clarence has 99 tickets . He gives 7 to Eugene . How many tickets will Clarence have ?

Answer:
92