1. The problem statement, all variables and given/known data Aluminum, which has a mass of 2.7 grams for each cubic centimeter of volume, can be rolled into thin sheets which your grandparents probably called "tinfoil." If a lump of aluminum of mass 0.75 kg is rolled into such a sheet 18 μm thick and 25 cm wide, approximately how long is this roll of "tinfoil?" 2. Relevant equations v = m/p p = density v = L * A surface area of circle = 4pi(r)^2 area of circle = pi(r)^2 3. The attempt at a solution I have spent alot of time on this problem but i can't seem to get it right i do not know what to do with the width or the thickness. I have tried to play it off like the width is the diameter,(which seems possible), but i just don't know what to do i have been working on this problem for 2 days now and i can't figure out what to do with it, please help i have a final on this tomorrow and i see it alot in the old exams so i would like to know how to approach it if the problem gives thickness and width.