At a party. andy and april shared a cherry pie. cut into 10 pieces. andy ate 3/10 of the pie and april ate 2/10 of the pie .what fraction of the pie did they eat altogether?

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?