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 many zeroes are there at the end of the number N, if N = 150! + 300! ?

 Option A: 28

 Option B: 31

 Option C: 34

 Option D: 37

 Option E: 40
[EX A]: Option D

[EX Q]: Question: A 300 m long train crosses a platform in 33 sec while it crosses a signal pole in 18 sec. What is the length of the platform?

 Option A: 286 m

 Option B: 250 m

 Option C: 277 m

 Option D: 278 m

 Option E: 267 m
[EX A]: Option B

[EX Q]: Question: If x, y, and z are positive integers and 3x = 4y = 7z, then the least possible value of x - y + z is

 Option A: 33

 Option B: 40

 Option C: 49

 Option D: 19

 Option E: 61
[EX A]:
Option D