You will be given a definition of a task first, then some input of the task.
Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

a lawn care company bought 4 lawnmower blade for $ 8 each . they also bought a spool of weed eater string for $ 7 . how much money did they spend on supplies ?
Output:
39