Step 1: Observe the pattern in the series:
Step 2: The pattern alternates between squares and cubes. The next number should be the square of 8:
Conclusion: The next number is 64.

Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?