Teacher: You are given a math word problem and you are supposed to only use subtraction 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: Sam is 6 feet tall and Alex is 5 feet tall 

 Question: By how many feet is Sam taller than Alex? 
Solution: 1
Reason:  Sam's height - Alex's height = 6-5 = 1

Now, solve this instance: Context: The grasshopper, the frog and the mouse had a jumping contest. The grasshopper jumped 39 inches. The grasshopper jumped 19 inches farther than the frog and the mouse jumped 12 inches lesser than the frog. 

 Question: How far did the mouse jump?
Student:
8