How to find quality?

If a mixture has a volume of 1,276 cubic cm and a mass of 100 grams and the vapor portion has a specific volume of 0.16 cubic meters per kg and the liquid portion has a specific volume of 0.0007 cubic meters per kg. What is the quality of the mixture? Using (v-vg)/(vg-vf) i keep getting -0.96. the correct answer... show more If a mixture has a volume of 1,276 cubic cm and a mass of 100 grams and the vapor portion has a specific volume of 0.16 cubic meters per kg and the liquid portion has a specific volume of 0.0007 cubic meters per kg.

What is the quality of the mixture?
Using (v-vg)/(vg-vf) i keep getting -0.96. the correct answer is 0.07571, but I don't know ho to get to that.
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