Question

How many cubes of sides 1 cm can be placed inside the given box?

Answer 1

Volume of box
= length $\times$ breadth $\times$ height
= 20 $\times$ 6 $\times$ 10 = 1200 cu cm.
Volume of cube of side 1 cm = 1 cu cm.
So, total 1200 cubes can be placed inside the given box.