What is the HCF of 30 and 15 and 9?

Oh, what a delightful question! Finding the Highest Common Factor (HCF) is like finding the common ground where numbers can meet and dance together. The HCF of 30, 15, and 9 is 3, like a gentle breeze that connects them all with harmony and unity. Just imagine those numbers holding hands and skipping along a happy little path together.