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.
One example is below.
Q: robin bought 11 sodas for her and her friends . if they only drank 3 of them how many extras did she have ?
A: 8
Rationale: Extra sodas is total - drank = 11-3 = 8
Q: 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 ?
A:
68