Six years ago from now, age of 'A' was ____ years. Ratio of present ages of 'A' and 'B' is ____ respectively and four years hence from now, sum of ages of 'A' and 'B' will be ____ years. The data given in which among the given options will fill the blank in the same order so as to make the statement true?
I. 18, 2:3, 68
II. 21, 3:5, 82
III. 22, 4:5, 75

Statement I:
Present age of 'A' = 18 + 6 = 24 years
Present age of 'B' = (3/2) × 24 = 36 years
Required sum = 24 + 4 + 36 + 4 = 68 years
So, statement I is true. Statement II:
Present age of 'A' = 21 + 6 = 27 years
Present age of 'B' = (5/3) × 27 = 45 years
Required sum = 27 + 4 + 45 + 4 = 80 years
So, statement II is not true. Statement III:
Present age of 'A' = 22 + 6 = 28 years
Present age of 'B' = (5/4) × 28 = 35 years
Required sum = 28 + 4 + 35 + 4 = 71 years
So, statement III is not true. Therefore, only statement I is true. Hence, option E .