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.
One example is below.
Q: Context: Sam is 6 feet tall and Alex is 5 feet tall

Question: By how many feet is Sam taller than Alex?
A: 1
Rationale: Sam's height - Alex's height = 6-5 = 1
Q: Context: After Olivia visited a supermarket there were 29 dollars left. If there were 54 dollars in her wallet initially

Question: How much did she spend?
A:
25