TASK DEFINITION: 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.
PROBLEM: Question: Which of the following CANNOT be weighed using a balance scale and these unit weights: 1, 4, 7, and 10

 Option A: 13

 Option B: 15

 Option C: 17

 Option D: 19

 Option E: 21

SOLUTION: Option A

PROBLEM: Question: 5 men are equal to as many women as are equal to 8 boys. All of them earn Rs.210 only. Menâ€™s wages are?

 Option A: 6Rs

 Option B: 2Rs

 Option C: 4Rs

 Option D: 9Rs

 Option E: 14Rs

SOLUTION: Option E

PROBLEM: Question: 5 men and 12 boys finish a piece of work in 4 days, 7 men and 6 boys do it in 5 days. The ratio between the efficiencies of a man and boy is?

 Option A: 6:9

 Option B: 6:89

 Option C: 6:0

 Option D: 6:5

 Option E: 6:1

SOLUTION:
Option D