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: Each of the integers from 0 to 9, inclusive, is written on a separate slip of blank paper and the ten slips are dropped into hat. If the slips are then drawn one at a time without replacement, how many must be drawn to ensure that the numbers on two of the slips drawn will have a sum of 9?

 Option A: 2

 Option B: 3

 Option C: 1

 Option D: 6

 Option E: 4

Answer: Option D


Question: Question: Find the odd one out:
125, 106, 85, 76, 65, 58, 53

 Option A: 33

 Option B: 85

 Option C: 26

 Option D: 18

 Option E: 222

Answer: Option B


Question: Question: A is 20% more efficient than B .how much time they will working together take to complete a job which A alone could have done in 15 days?

 Option A: 5 6/11 days

 Option B: 8 2/11 days

 Option C: 6 4/8 days

 Option D: 4 days

 Option E: 17 days

Answer:
Option B