The students in mr. perez’s math class sit in sections of the classroom. there are 9 students in 14 of the classroom.
what fraction of the entire classroom is for 1 student?

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?