First I calculated the volume of all of the logs...
V = 13((pi)(.225)^2(g)) = 3.94
Then wanted the mass of the logs
m = density(Volume)
density = .6(997)
m = 2356
Then calculated buoyant force...
Fb = (997)(3.94)(9.8) = 3928
Then set this equal to weight of people and logs
38496 = ((number...