Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
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
संबंधित प्रश्न
The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per m2.
A cuboid is of dimensions 60 cm × 54 cm × 30 cm. How many small cubes with side 6 cm can be placed in the given cuboid?
Find the volume of a cuboid whose length =1.2 m, breadth = 30 cm, height = 15 cm.
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 volume of a cuboidal box is 48 cm3. If its height and length are 3 cm and 4 cm respectively, find its breadth.
If l is the length of a diagonal of a cube of volume V, then
The length, breadth and height of a rectangular solid are in the ratio 5 : 4 : 2. If the total surface area is 1216 cm2, find the length, the breadth and the height of the solid.
Find the volume and total surface area of a cube whose each edge is:
(i) 8 cm
(ii) 2 m 40 cm.
The total surface area of a cube is 216 cm2. Find its volume.
The external dimensions of an open wooden box are 65 cm, 34 cm, and 25 cm. If the box is made up of wood 2 cm thick, find the capacity of the box and the volume of wood used to make it.
