If 4x=60 what is the value of x?

What fraction of one year is 8 months

How to use order of operation in 20 divide by 4 multiply 5 = 1

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?