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A slab of ice floats on a freshwater lake. What is the minimum volume of the slab such that a 70 kg man can stand on it without getting his feet wet? The density of ice is 0.922 kg/m^3 and the density of freshwater is 1,000 kg/m^3

I have gotten to mass(ice) + mass(person) = Density of water x volume submerged

From there I have two unknown variables I am at a loss