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
A milk container is 8 cm long and 50 cm wide. What should be its height so that it can hold 4 litres of milk?
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?
The volume of a cuboidal box is 48 cm3. If its height and length are 3 cm and 4 cm respectively, find its breadth.
A rectangular diesel tanker is 2 m long, 2 m wide and 40 cm deep. How many litres of diesel can it hold?
The length of a hall is 18 m and the width 12 m. The sum of the areas of the floor and the flat roof is equal to the sum of the areas of the four walls. Find the height of the wall.
Total surface area of a box of cuboid shape is 500 sq. unit. Its breadth and height is 6 unit and 5 unit respectively. What is the length of that box ?
A solid cuboid of metal has dimensions 24 cm, 18 cm, and 4 cm. Find its volume.
The capacity of a rectangular tank is 5.2 m3 and the area of its base is 2.6 x 104 cm2; find its height (depth).
The dimensions of a hall is 10 m × 9 m × 8 m. Find the cost of white washing the walls and ceiling at the rate of ₹ 8.50 per m2
