instruction:
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.
question:
after paying $ 2.30 for a drink bryon has $ 17.15 . how much money did he have before buying the drink ?
answer:
19.45

question:
the library has 75 science books . the second graders borrowed 18 of them . what 's the difference between the number of science books the library has in the beginning and the second graders borrowed ?
answer:
57

question:
it is buddy 's first day at a new school and he is feeling very nervous . his day begins with some bacon and egg prepared by his mother . after eating and preparing buddy headed out to catch the school bus from the nearest bus stop . including buddy there were 39 students that got on the bus during the first stop . if 29 more students got on the bus at the second stop how many students are riding the bus ?
answer:
68