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.

[Q]: Question: When n is divided by 19, the remainder is 7. When n is divided by 11, the quotient is equal to Z, and the remainder is equal to 7. Z must be divisible by which of the following numbers?

 Option A: 16

 Option B: 18

 Option C: 20

 Option D: 19

 Option E: 22
[A]: Option D


[Q]: Question: The radius of a cylinder is 8 m, height 14 m. The volume of the cylinder is:

 Option A: 2816

 Option B: 5500

 Option C: 3300

 Option D: 1100

 Option E: 4400
[A]: Option A


[Q]: Question: Two trains of length 100 m and 200 m are 100 m apart. They start moving towards each other on parallel tracks, at speeds 36 kmph and 72 kmph. After how much time will the trains meet?

 Option A: 10/3 sec

 Option B: 20/4 sec

 Option C: 20/7 sec

 Option D: 22/7 sec

 Option E: 60/7 sec
[A]:
Option A