Advertisements
Advertisements
प्रश्न
A closed iron tank 12 m long, 9 m wide and 4 m deep is to be made. Determine the cost of iron sheet used at the rate of Rs. 5 per metre sheet, sheet being 2 m wide.
Advertisements
उत्तर
Given length =12,m Breadth = 9m and Height = 4m.
Total surface area of tank`=2(lb+bh+hl)`
`=2[12xx9+9xx4+12xx4]`
`=2[108+36+48]`
`=384m^2`
`"Now length of iron sheet"=(384)/("width of iron sheet" )`
`=384/2=194m.`
Cost of iron sheet = length of sheet xx cost rate
`=192xx5=Rs.960`
APPEARS IN
संबंधित प्रश्न
Each edge of a cube is increased by 50%. Find the percentage increase in the surface area of the cube.
What will happen to the volume of a cuboid if its Length is doubled, height is same and breadth is halved?
A cuboid has total surface area of 50 m2 and lateral surface area is 30 m2. Find the area of its base.
If the perimeter of each face of a cube is 32 cm, find its lateral surface area. Note that four faces which meet the base of a cube are called its lateral faces.
The length, breadth, and height of a room are 6 m, 5.4 m, and 4 m respectively. Find the area of :
(i) its four-walls
(ii) its roof.
Find the volume of wood required to make a closed box of external dimensions 80 cm, 75 cm, and 60 cm, the thickness of walls of the box being 2 cm throughout.
A closed box measures 66 cm, 36 cm and 21 cm from outside. If its walls are made of metal-sheet, 0.5 cm thick; find :
(i) the capacity of the box ;
(ii) the volume of metal-sheet and
(iii) weight of the box, if 1 cm3 of metal weighs 3.6 gm.
A tank 30 m long, 24 m wide, and 4.5 m deep is to be made. It is open from the top. Find the cost of iron-sheet required, at the rate of ₹ 65 per m2, to make the tank.
A cube of edge 6 cm and a cuboid with dimensions 4 cm x x cm x 15 cm are equal in volume. Find:
(i) the value of x.
(ii) the total surface area of the cuboid.
(iii) the total surface area of the cube.
(iv) which of these two has a greater surface and by how much?
In a building, there are 24 cylindrical pillars. For each pillar, the radius is 28 m, and the height is 4 m. Find the total cost of painting the curved surface area of the pillars at the rate of ₹ 8 per m2.
