Question

A box is made of wood 5cm thick, its internal dimension are 10cm by 8cm by 11cm, what is the volume of the wood in the box

Answer 1

volume wood=volume outside-volume inside
= (10+2*5)(8+2*5)(11+2*5)-10*8*11
= 20*18*21-10*8*11
Man, that is thick wood.