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: Find the fourth proportion to 2,4,6

Option A: 18

Option B: 12

Option C: 9

Option D: 6

Option E: 8
[A]: Option B

[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
[A]: Option B

[Q]: Question: In a class of 5 students, average weight of the 4 lightest students is 40 kgs, Average weight of the 4 heaviest students is 45 kgs. What is the difference between the the maximum and minimum possible average weight overall?

Option A: 2.8 kgs

Option B: 3.2 kgs

Option C: 3 kgs

Option D: 4 kilograms

Option E: 2 kgs
[A]:
Option D