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: There were 4 friends playing a video game online when 5 more players joined the game . If each player had 3 lives , how many lives did they have total ?

Answer: 27


Question: There are 2 bananas in a pile on the desk . Each banana comes in a package of 13 . 7 bananas are added to the pile . How many bananas are there in the pile ?

Answer: 9


Question: Luke had 20 stickers . He bought 12 stickers from a store in the mall and got 20 stickers for his birthday . Then Luke gave 5 of the stickers to his sister and used 8 to decorate a greeting card . How many stickers does Luke have left ?

Answer:
39