Question

if V is the volume of a cuboid of dimension x,y,z and A is its surface area then A/V

Answer 1

volume of cuboid (V) = xyz
surface area of cuboid (A) =2(xy+yz+zx)

now,
A/V =2 (xy+yz +zx )/xyz
=2 { 1/z + 1/x + 1/y }

Answer 2

let length= l ,breath=b, height =h Volume of cuboid is(V)
l × b× h
total Surface area of cuboid (V)=
2(l×b+b× h+l ×h)
A/V= 2(1/h + 1/l +1/b)