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.

Q: the third graders are having a fair . they have 90 tickets to sell . they sold 38 tickets the first week and 17 tickets the second week . how many tickets do they have left to sell ?

A: 35
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Q: emily owned 6 songs by her favorite artists . later on she bought 7 more songs . how many songs did she have totaled ?

A: 13
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Q: oliver was yard sale shopping . he ended up buying 11 video games but only 6 of them worked . how many bad games did he buy ?

A:
5
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