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: 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
[A]: Option B

[Q]: Question: Two pipes A and B can separately fill a cistern in 10 and 15 minutes respectively. A person opens both the pipes together when the cistern should have been was full he finds the waste pipe open. He then closes the waste pipe and in another 4 minutes the cistern was full. In what time can the waste pipe empty the cistern when fill?

Option A: 7

Option B: 9

Option C: 5

Option D: 4

Option E: 8
[A]: Option E

[Q]: Question: A die is thrown three times. Events X and Y are defined as below:
X : 4 on the third throw
Y : 6 on the first and 5 on the second throw
What is the probability of X given that Y has already occurred.

Option A: 1/6

Option B: 1/7

Option C: 1/8

Option D: 1/11

Option E: 1/13
[A]:
Option A