You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
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Question: Question: The average age of 31 students in a group is 16 years. when teacher's age is included to it, the average increases by one.What is the teacher's age in years?

 Option A: 31

 Option B: 36

 Option C: 48

 Option D: 45

 Option E: 57

Answer: Option C


Question: Question: If 5 ministers are to be seated at a round table conference, then how many different ways can they be seated?

 Option A: 240

 Option B: 60

 Option C: 24

 Option D: 720

 Option E: 180

Answer: Option C


Question: Question: 8k8
+ k88
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1,6y6
If k and y represent non-zero digits within the integers above, what is y?

 Option A: 6

 Option B: 7

 Option C: 8

 Option D: 9

 Option E: 17

Answer:
Option A