If V is the volume of a cuboid of dimension x, y, z and A is its surface, then A/V will be equal to
2. ½( 1/xy + 1/ xz + 1/ yz)
3. ½ ( 1/x +1/y+1/z)
V = xyz
A = 2 (xy + yz + zx)
A/V= 2(xy+yz+zx) / xyz = 2(1/x + 1/y + 1/z)
If question were what is V/A, then
V/A = xyz / [2(xy+yz+zx)] = 1 / [2 (1/x + 1/y + 1/z)]
In the given answer choices, if u put a extra bracket in the answer choice 3, then that will match with V/A.
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