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What is the smallest number of whole logs (p (density) 725 kgm^-3) r= .0800m l=3.00m that can be used to build a raft that will carry four people each with a mass of 80.0 kg.

so using (pi*r^2*l)*725 i found the mass of each log to be 43.7 kg

BUt beyond this i run into huge headaches by trying to derive something that can include X # of 43.7 kg logs in relation to bouyant force and Weight

please help