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: How much more would Rs.20000 fetch, after two years, if it is put at 20% p.a. compound interest payable half yearly than if is put at 20% p.a. compound interest payable yearly?

 Option A: 482

 Option B: 297

 Option C: 278

 Option D: 298

 Option E: 279
[EX A]: Option A

[EX Q]: Question: A bag contains 12 red marbles. If someone were to remove 2 marbles from the bag, one at a time, and replace the first marble after it was removed, the probability that neither marble would be red is 49/64. How many marbles are in the bag?

 Option A: 24

 Option B: 48

 Option C: 60

 Option D: 96

 Option E: 84
[EX A]: Option D

[EX Q]: Question: A train is moving at a speed of 75km/hr and its length is 500m. Find the time taken by it to pass a man standing near the railway line?

 Option A: 30sec

 Option B: 45sec

 Option C: 36sec

 Option D: 24sec

 Option E: 52sec
[EX A]:
Option D