Advertisements
Advertisements
प्रश्न
An open box is made of wood 3 cm thick. Its external length, breadth and height are 1.48 m, 1.16 m and 8.3 m. Find the cost of painting the inner surface of Rs 50 per sq. metre.
Advertisements
उत्तर
Given
Length =1.48m=148cm.
Breath =1.16m =116 cm
Height = 8.3m = 83cm
Thickness of wood = 3cm
∴ inner dimensions:
Length (148 - 2 x 3)cm = 142cm
Breadth (116 - 2 x 3) cm = 110cm
Height= (83 - 3) cm = 80cm.
Inner surface area = 2 (l + b) + lb
`=2[(142)+100)80+142xx110cm^2]`
`2(252)[80]+142xx110cm^2=55,940cm^2`
`=559.40m^2`
Hence, cost of painting inner surface area
`=5,5940xxRs.50`
`=Rs.279.70`
APPEARS IN
संबंधित प्रश्न
How many wooden cubical blocks of side 25 cm can be cut from a log of wood of size 3 m by 75 cm by 50 cm, assuming that there is no wastage?
A cuboidal box is 5 cm by 5 cm by 4 cm. Find its surface area.
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 1 m. Find the cost of painting the walls at Rs 3.50 per square metre.
A cuboid has total surface area of 372 cm2 and its lateral surface area is 180 cm2, find the area of its base.
A cube whose volume is 1/8 cubic centimeter is placed on top of a cube whose volume is 1 cm3. The two cubes are then placed on top of a third cube whose volume is 8 cm3. The height of the stacked cubes is
The dimensions of a Cinema Hall are 100 m, 60 m, and 15 m. How many persons can sit in the hall if each requires 150 m3 of air?
The total surface area of a cube is 216 cm2. Find its volume.
A solid cuboid of metal has dimensions 24 cm, 18 cm, and 4 cm. Find its volume.
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.
The total surface area of a cuboid with dimension 10 cm × 6 cm × 5 cm is
