# If the Box Has Length, Breadth and Height as 80 Cm, 40 Cm and 20 Cm Respectively. How Many Square Sheets of Paper of Side 40 Cm Would She Require? - Mathematics

Mary wants to decorate her Christmas tree. She wants to place the tree on a wooden block
covered with coloured paper with picture of Santa Claus on it. She must know the exact
quantity of paper to buy for this purpose. If the box has length, breadth and height as 80
cm, 40 cm and 20 cm respectively. How many square sheets of paper of side 40 cm would
she require?

#### Solution

Given that mary wants to paste the paper on the outer surface of the box; The quantity of
the paper required would be equal to the surface area of the box which is of the shape of
cuboid. The dimension of the box are
Length (l)=80cm Breath (b) = 40 cm and height (h) 20cm
The surface area of thee box = 2[lb+bh+hl]

=2[80(40)+40(20)+20(80)]

2(5600)=11,200cm^2

The area of the each sheet of paper=40xx40cm^2

=1600cm^2

∴Number of sheets required =

("surface  areaa  of  box")/("area of  one  sheet of paper ")

=(11,200)/1600=7

Concept: Surface Area of a Cuboid
Is there an error in this question or solution?

#### APPEARS IN

RD Sharma Mathematics for Class 9
Chapter 18 Surface Areas and Volume of a Cuboid and Cube
Exercise 18.1 | Q 4 | Page 14

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