Question

4. If each edge of a cube is reduced by 25%, find the
percentage decrease in its total surface area.​

Answer 1

LET EDGE OF CUBE IS" a "unit given that edge of cube reduced previous 25percent ,previous surface area=6xa^2 Now, new edge=3a/4 here surface area=27/8a^2 decrease in area=previous area-present area=21a^2/8 hence percentage decreased in area=175/4percent.