Comprehension Passage
There are two groups of friends, and both groups are divided into four friends in each group. Group 1 namely A, B, C, and D, and Group 2 namely W, X, Y, and Z. Each can complete the work in a different number of days. X can complete the work in 15 days. The number of days taken by C to complete the work is 20% more than the number of days taken by X to complete the work. The number of days taken by A is 9 more than the number of days taken by X to complete the work. The number of days taken by W is half of the number of days taken by A to complete the work. The number of days taken by Y is 100% more than the number of days taken by C. The efficiency of Z is 20% more than the efficiency of Y. Ratio of the number of days taken by A and D is 8:15, respectively. The number of days taken by B is 16 more than the number of days taken by A to complete the work.
W, Y, C, and A work on alternate days in this order, then how many days will the work be completed?
1
15 days
2
18 days
3
19 days
4
17 days
5
16 days