book Maths Puzzle Numerical Ability

What is the degree of the polynomial 12xy^3-7y^2z^5+5x^6y-2X^2y^2

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I have been out of school for about 6 years now, and my algebra is pretty rusty. I'm trying to help my sister with her college algebra homework, and I can't remember how to work a change 80 lb/ft3 to ton/ yrd3