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.

What does this have to do with the breathing disorder?

To find the volume of the wood required to make the open box, we need to calculate the volume of the external dimensions of the box and then subtract the volume of the internal dimensions.

First, let's calculate the external dimensions of the box. Since the wood is 1.5cm thick, we need to add 1.5cm to each side of the internal dimensions.

The external dimensions of the box would be:
Length = 20cm + 2(1.5cm) = 20cm + 3cm = 23cm
Width = 12.5cm + 2(1.5cm) = 12.5cm + 3cm = 15.5cm
Height = 9.5cm + 1.5cm = 11cm

Now, let's calculate the volume of the external dimensions:
Volume = Length x Width x Height
Volume = 23cm x 15.5cm x 11cm

Next, let's calculate the volume of the internal dimensions:
Volume = Length x Width x Height
Volume = 20cm x 12.5cm x 9.5cm

Finally, let's calculate the volume of the wood required by subtracting the volume of the internal dimensions from the volume of the external dimensions:
Volume of wood = Volume of external dimensions - Volume of internal dimensions

So, the volume of wood required to make the open box is:
Volume of wood = (23cm x 15.5cm x 11cm) - (20cm x 12.5cm x 9.5cm)

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

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

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