A cuboid has a volume of 60 cubic centimetres. Its base is a rectangle measuring 5 centimetres by 4 centimetres. How tall is the cuboid?

Explanation

Each layer one centimetre thick holds 5 times 4 unit cubes, so 60 cubes need 60 shared between 20. Dividing by only one of the base measurements leaves the other length still buried inside the answer, which is why 12 and 15 both come out far too tall.