You are given a math word problem and you are supposed to apply an addition mathematical operator 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: Context: Jerry had 8 action figures and 9 books on a shelf in his room. Later he added 10 more books to the shelf. 

 Question: How many books were on his shelf in all?

Answer: 19


Question: Context: For the walls of the house he would use 12 large planks of wood and 10 small planks. If large planks together need 15 pieces of nails to be secured and small planks together need 5 nails. 

 Question: How many nails does John need for the house wall?

Answer: 20


Question: Context: 13 campers went rowing and 59 campers went hiking in the morning. 21 campers went rowing in the afternoon. 

 Question: How many campers went rowing in all?

Answer:
34