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: The 120 students in a group are to be seated in rows so that there is an equal number of students in each row. Each of the following could be the number of rows EXCEPT

 Option A:  4

 Option B:  20

 Option C:  30

 Option D:  40

 Option E:  90

SOLUTION: Option E

PROBLEM: Question: A mixture contains alcohol and water in the ratio 4 : 3. If 5 litres of water is added to the mixture, the ratio becomes 4: 5. Find the quantity of alcohol in the given mixture

 Option A: 15 litres

 Option B: 10 litres

 Option C: 30 litres

 Option D: 22 litres

 Option E: 8 litres

SOLUTION: Option B

PROBLEM: Question: A can do a half of certain work in 60 days and B one third of the same in 35 days. They together will do the whole work in.

 Option A: 56 days

 Option B: 420 days

 Option C: 46 days

 Option D: 560 days

 Option E: 96 days

SOLUTION:
Option A