Monique and Tara each make an ice-cream sundae. Monique gets 3 scoops of Cherry ice-cream and 1 scoop of Mint Chocolate Chunk ice-cream for a total of 61 g of fat. Tara has 1 scoop of Cherry and 3 scoops of Mint Chocolate Chunk for a total of 63 g of fat. How many grams of fat does 1 scoop of each type of ice
cream have?

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?