Question

Q-20 The length, breadth, and height of a rectangular box are 80 cm, 40 cm, and 20 cm,
respectively. If a square paper of 40 cm length is to be glued on it, how many such
papers will be required?

Answer 1

Surface area of a rectangle=l.b+b.h+h.l

=80×40+40×20+20×80

=3200+800+1600

=5600cm^2

Area of the square paper=side ×side

=40×40

=1600cm^2

Number of paper required=Area of box/Area of

paper

=5600/1600

3.5

So,3 full sheet and a half sheet will be required.