How do you show your work for 75 x 98

On a architect's drawing of a house, 1 inche representa 1.5

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?

We have 339 ounces of jam to be divided up equally for 12 people how muny ounces will each person get