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.

Example input: 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?
Example output: 0
Example explanation: Number of children who got on -> 21 - 5 + x = 16 , x = 0, hence no one got onto the bus
Q: Context: The grasshopper, the frog and the mouse had a jumping contest. The grasshopper jumped 19 inches. The frog jumped 10 inches farther than the grasshopper and the mouse jumped 20 inches farther than the frog. 

 Question: How much farther did the mouse jump than the grasshopper?
A:
30