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 total of the ages of Amar, Akbar and Anthony is 30 years. What was the total of their ages three years ago ?

Option A: 20 years

Option B: 28 years

Option C: 71 years

Option D: 21 years

Option E: 31 years

SOLUTION: Option D

PROBLEM: Question: Kiran is younger than Bineesh by 7 years and their ages are in the respective ratio of 7:9. How old is Kiran?

Option A: 22.5

Option B: 24.5

Option C: 23.5

Option D: 25.5

Option E: 26.5

SOLUTION: Option B

PROBLEM: Question: If a and b are prime numbers, which of the following CANNOT be the sum of a and b?

Option A: 5

Option B: 9

Option C: 23

Option D: 16

Option E: 13

SOLUTION:
Option C