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# The Dimensions of a Room Are 12.5 M by 9 M by 7 M. There Are 2 Doors and 4 Windows in the Room; Each Door Measures 2.5 M by 1 .2 M and Each Window 1 .5 M by I M. - CBSE Class 9 - Mathematics

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ConceptSurface Area of a Cuboid and a Cube

#### Question

The dimensions of a room are 12.5 m by 9 m by 7 m. There are 2 doors and 4 windows in the room; each door measures 2.5 m by 1 .2 m and each window 1 .5 m by I m. Find the cost of painting the walls at Rs. 3.50 per square metre.

#### Solution

Given length of room =12.5m
Breadth of room = 9m
Height of room = 7m
∴Total surface area of 4 walls
=2(l+b)xxh
=2(12.5+9)xx7
=30lm^2
Area of 2 doors =2[2.5xx1.2]
= 6 m^2
Area to be painted on 4 walls
= 301-(6+6)
=301-12=289  m^2
∴ "cost of painting" = 289 xx 3.50
Rs.1011.5

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#### APPEARS IN

RD Sharma Solution for Mathematics for Class 9 by R D Sharma (2018-19 Session) (2018 to Current)
Chapter 18: Surface Areas and Volume of a Cuboid and Cube
Ex.18.10 | Q: 14 | Page no. 14
Solution The Dimensions of a Room Are 12.5 M by 9 M by 7 M. There Are 2 Doors and 4 Windows in the Room; Each Door Measures 2.5 M by 1 .2 M and Each Window 1 .5 M by I M. Concept: Surface Area of a Cuboid and a Cube.
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