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.

[EX Q]: Question: If 12 men do a work in 80 days, in how many days will 16 men do it?

 Option A: 17 days

 Option B: 19 days

 Option C: 15 days

 Option D: 60 days

 Option E: 14 days
[EX A]: Option D

[EX Q]: Question: For positive integers x and z, which of the following can be written as z^2?

 Option A: x^2+1

 Option B: x^2-1

 Option C: x^2-24

 Option D: x^2+11

 Option E: x^2-11
[EX A]: Option D

[EX Q]: Question: A fellow borrowed a certain sum of money at 3% per annum at simple interest and in 3 years the interest amounted to Rs.1820 less than the sum lent. What was the sum lent?

 Option A: 1050

 Option B: 1220

 Option C: 1250

 Option D: 2000

 Option E: 1110
[EX A]:
Option D