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.

[Q]: Context: For the walls of the house he would use 12 large planks of wood and 17 small planks. If each large plank of wood needs 14 pieces of nails to be secured and each small plank needs 25 nails. 

 Question: How many planks does John need for the house wall?
[A]: 29


[Q]: Context: 21 children were riding on the bus. At the bus stop 10 children got off the bus while some more got on the bus. Then there were 16 children altogether on the bus. 

 Question: How many children got on the bus at the bus stop?
[A]: 5


[Q]: Context: Robin's hair was 16 inches long. He cut off 11 inches. Then it again grew by 12 inches. 

 Question: How long is his hair now?
[A]:
17