10 feet of common 2-inch-bore lead piping weighs 50 lb. What is the formula for the weight of x feet of such lead piping? --Sawyer, Mathematician's Delight
I am not sure about what I am asked to do here. It is known that $$10F*2=50$$ and I am asked to write it down as $$XF*2=W$$ or is it something else?