Question

three cubes of equal centimetres are joined together and to end find the volume of the resulting cuboid

Answer 1

lets the side of 1 cube be = a

so volume of 1 cube = a³

now they are joined end to end, and we have 3 cubes.
so the volume will be 3×a³ = 3a³ cm³

and if you want to do it the other way, then the length of newly formed rectangle is 3a

breath=a
height =a

volume = l×b×h
=3a×a×a

= 3a³ cm³

as you haven't mentioned the length of side and just "cm", just put in the value of side!

Answer 2

your answer is ready here