Advertisements
Advertisements
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`
APPEARS IN
RELATED QUESTIONS
Three cuboids of dimensions 5 cm × 6 cm × 7cm, 4cm × 7cm × 8 cm and 2 cm × 3 cm × 13 cm are melted and a cube is made. Find the side of cube.
The length , breadth and height of a room are 5 m, 4.5 m and 3 m, respectively. Find the volume of the air it contains.
How many planks each of which is 3 m long, 15 cm broad and 5 cm thick can be prepared from a wooden block 6 m long, 75 cm broad and 45 cm thick?
A solid rectangular piece of iron measures 6 m by 6 cm by 2 cm. Find the weight of this piece, if 1 cm3 of iron weighs 8 gm.
A field is 150 m long and 100 m wide. A plot (outside the field) 50 m long and 30 m wide is dug to a depth of 8 m and the earth taken out from the plot is spread evenly in the field. By how much is the level of field raised?
If each edge of a cuboid of surface area S is doubled, then surface area of the new cuboid is
A closed box is made of wood 5 mm thick. The external length, breadth and height of the box are 21 cm, 13 cm and 11 cm respectively. Find the volume of the wood used in making the box.
375 persons can be accommodated in a room whose dimensions are in the ratio of 6 : 4 : 1. Calculate the area of the four walls of the room if the each person consumes 64m3 of air.
The surface area of a cuboid formed by joining two cubes of side a face to face is ______.
The surface area of a cuboid formed by joining face to face 3 cubes of side x is 3 times the surface area of a cube of side x.
