I\'m having no luck with this problem and the answer someone elsegave isn\'t pos

Question

I'm having no luck with this problem and the answer someone elsegave isn't possible based on my answer sheet. If anyone couldexplain how to correctly do this problem, I'll rank themlife-saver. Thanks.
What is the smallest number of whole logs (p = 725 kg/m^3,radius = 0.0800 m, length = 3.00 m) that can be used to built araft that will carry four people, each of whom has a mass of 80.0kg?
What is the smallest number of whole logs (p = 725 kg/m^3,radius = 0.0800 m, length = 3.00 m) that can be used to built araft that will carry four people, each of whom has a mass of 80.0kg?

Explanation / Answer

So, to support 4*80 = 320 kg, we need 320/16.6 which is 19.3. Since logs only come in integer units, we need 20 logs.

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