Pranali is Ashwin's younger sister. She is years younger than Ashwin. Write Pranali's age in terms of Ashwin's age. Take Ashwin's age to be years.
Let the Ashwin's age be years.
Given that, Pranali is Ashwin's younger sister and she is years younger than Ashwin.
That means Pranali's age is years.
Therefore, Pranali's age years.