Question

Find the volume of the wood required to make an open box of internal dimensions 20cm by 12.5cm by 9.5 cm.the wood being 1.5cm thick.

Answer 1

What does this have to do with the breathing disorder?

Answer 2

... probably some weird auto-correct that Anonymous's phone or tablet made.

This is what happens when someone doesn't proofread before posting!!

Answer 3

assuming it is the height that is 9.5
outside volume = 23 * 15.5 * 11
inside volume = 20 * 12.5 *9.5
now subtract the inside from the outside