At Westonci.ca, we connect you with the answers you need, thanks to our active and informed community. Get immediate answers to your questions from a wide network of experienced professionals on our Q&A platform. Discover in-depth answers to your questions from a wide network of professionals on our user-friendly Q&A platform.

A boy is 9 years old and his sister is twice his age. when the boy is 15, his sister will be (?) years old.