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: In a company 200 persons, working 6 hours per day complete 1/3 rd of the work in 7 days. Employee number of additional persons, working 4 hrs per day, required to complete the remaining work in 15 days is :

 Option A: 60

 Option B: 80

 Option C: 90

 Option D: 70

 Option E: 50
[EX A]: Option B

[EX Q]: Question: The sector of a circle has radius of 42 cm and central angle 135o. Find its perimeter?

 Option A: 91.5 cm

 Option B: 92.2 cm

 Option C: 28.9 cm

 Option D: 29.2 cm

 Option E: 183 cm
[EX A]: Option E

[EX Q]: Question: A mixture contains milk and water in the ratio 5:2. On adding 10 liters of water, the ratio of milk to water becomes 5:3. The quantity of milk in the original mixture is?

 Option A: 30

 Option B: 40

 Option C: 50

 Option D: 60

 Option E: 70
[EX A]:
Option C