Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Context: 21 children were riding on the bus. At the bus stop 5 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?
Solution: 0
Reason: Number of children who got on -> 21 - 5 + x = 16 , x = 0, hence no one got onto the bus

Now, solve this instance: 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?
Student:
27