Directions: Study the following information carefully and answer the questions given below.
There are five groups [X, Y, Z, W, and V]. Each group consists of six members: Veteran Member, Senior Member, Leader, Deputy Leader, Junior Member, and Youngest Member (arranged in the decreasing order of their ages). The following table provides details about the age of the Veteran Member, the ratio of the ages of the Veteran Member and the Senior Member, the ratio of the ages of the Leader and the Deputy Leader, the age of the Youngest Member, and the age of the Junior Member. Some values in the table are missing.
| V | W | Z | Y | X | |
| The age of the Youngest Member | ----- | ----- | 20 | ----- | 18 |
| The age of the Junior Member | 27 | ----- | 25 | 22 | ----- |
| The ratio of the ages of the Leader and the Deputy Leader | 15:14 | 16:14 | ----- | ----- | ----- |
| The ratio of the ages of the Veteran Member and the Senior Member | ----- | 15:16 | ----- | 21:20 | ----- |
| The age of the Veteran Member | 80 | ----- | ----- | ----- | 72 |
The age of the Youngest Member of Group X is 10% less than the age of the Junior Member of that group. The difference between the age of the Leader in Group X and the age of the Senior Member is equal to (40% of 50 years). The age of the Deputy Leader is double the age of the Junior Member after 2 years, and the Veteran Member is 4 years older than the Senior Member. Find the possible average age of Group X where y = 7.5.
I. 8y - 15
II. 7y - 21
III. 3y + 22.5