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.

[EX Q]: amy bought 7 pencils at the school store but she already had 3 pencils . how many pencils does she have totaled ?
[EX A]: 10

[EX Q]: kaleb had 67 cherries . after eating some he had 42 left . how many cherries did kaleb eat ?
[EX A]: 25

[EX Q]: there were 94 dollars in olivia 's wallet . after she visited a supermarket there were 78 dollars left . how much did she spend ?
[EX A]:
16