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.

Input: Consider Input: Question: (3x + 1) (2x - 5) = ax^2 + kx + n . What is the value of a - n + k ?

 Option A: 5

 Option B: 8

 Option C: 9

 Option D: 14

 Option E: 11

Output: Option D


Input: Consider Input: 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

Output: Option B


Input: Consider Input: Question: A father said to his son, "I was as old as you are at the present at the time of your birth". If the father's age is 100 years now, the son's age five years back was:

 Option A: 45 years.

 Option B: 40 years.

 Option C: 30 years.

 Option D: 35 years.

 Option E: 50 years.


Output: Option A