What is the present age of Ashish? I. Ashish is 4 years younger than Akash. The ratio of the age of Akash and Aman is 4:5. II. Aman is 9 years older than Ashish and the present age of Akash is 20 years. III. The present age of Ashish is 5 years less than the age of Mohan who is 25 years.

Statement II alone is sufficient: Aman is 9 years older than Ashish, and Akash is 20 years. Given Akash:Aman = 4:5, if Akash = 20, then Aman = 25. Therefore Ashish = 25 - 9 = 16 years. Statement III also gives Ashish = 25 - 5 = 20 years, which conflicts. Since each statement alone gives answer but answers differ, we need 'None of these' as correct.