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.

Context: Winter is almost here and most animals are migrating to warmer countries. There are 3 bird families living near the mountain. 26 new bird families came to live near the mountain from the arctic while 2 bird families flew away further south for winter. 

 Question: How many bird families were left near the mountain?
27

Context: Adam has 4 more apples than Jackie. Together Adam and Jackie have 14 apples. Bob has 6 apples more than Adam and Jackie together do. 

 Question: How many apples does Bob have?
20

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?

29