exam Maths Puzzle Numerical Ability

The formula A=6V^2/3 gives the surface area of a cude in terms on its colume V. What is the volume of a cube with surface area of 12 square feet?

I come up with, 12=6(1)^2/3 So the colume is 1.
Am I correct?

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exam Other Question

add: -6+12+(-5)+3 Find the functions f and g so that the composition of f and g is H.
H(x)=cuberoot(x+1)