Correct Answer - Option 4 : 8
The logic followed is:
Let the age of Balu be “x” years.
Since Arjun is 4 years older than Balu.
Therefore, the age of Arjun = (x+4) years
Since Arjun is 4 years younger than Chandu, it means Chandu is 4 years older than Arjun
Therefore, age of Chandu = Age of Arjun + 4
= [(x + 4) + 4] years = (x + 8) years
Since Balu and Dinesh are twins
Therefore, age of Dinesh = age of Balu = x years
Difference between ages of Chandu and Dinesh = [(x + 8) - x] years = 8 years
Therefore, Chandu is 8 years older than Dinesh
Hence, the correct answer is "8".