Advertisements
Advertisements
प्रश्न
How many bricks each of size 25 cm × 10 cm × 8 cm will be required to build a wall 5 m long, 3 m high and 16 cm thick, assuming that the volume of sand and cement used in the construction is negligible?
Advertisements
उत्तर
\[\text { Dimension of a brick } = 25 cm \times 10 cm \times 8 cm\]
\[\text { Volume of a brick = 25 cm } \times 10 cm \times 8 cm\]
\[ = 2000 {cm}^3 \]
Also, it is given that the length of the wall is 5 m
\[ =5\times100 cm ( \because 1 m = 100 cm)\]
\[ =500 cm\]
\[ \text { Height of the wall = 3 m }\]
\[ =3\times100 cm ( \because 1 m = 100 cm)\]
\[ =300 cm\]
\[\text { It is 16 cm thick, i . e . , breadth = 16 cm } \]
\[{ \text { Volume of the wall = length }} \times \text { breadth }\times \text { height } = 500 \times 300 \times 16 = 2400000 {cm}^3 \]
\[ \therefore \text { The number of bricks needed to build the wall } = \frac{\text { volume of the wall }}{\text { volume of a brick }} = \frac{2400000 {cm}^3}{2000 {cm}^3} = 1200\]
संबंधित प्रश्न
A small indoor greenhouse (herbarium) is made entirely of glass panes (including base) held together with tape. It is 30 cm long, 25 cm wide and 25 cm high. What is the area of the glass?
Water is pouring into a cubiodal reservoir at the rate of 60 litres per minute. If the volume of the reservoir is 108 m3, find the number of hours it will take to fill the reservoir.
Find the ratio of the total surface area and lateral surface area of a cube.
A cloassroom is 11 m long, 8 m wide and 5 m high. Find the sum of the areas of its floor and the four walls (including doors, windows, etc.)
If two cubes each of side 6 cm are joined face to face, then find the volume of the resulting cuboid.
Three equal cubes are placed adjacently in a row. The ratio of the total surface area of the resulting cuboid to that of the sum of the surface areas of three cubes, is
Volume of a cuboid is 12 cm3. The volume (in cm3) of a cuboid whose sides are double of the above cuboid is
The external dimensions of a closed wooden box are 27 cm, 19 cm, and 11 cm. If the thickness of the wood in the box is 1.5 cm; find:
- The volume of the wood in the box;
- The cost of the box, if wood costs Rs. 1.20 per cm3;
- A number of 4 cm cubes that could be placed into the box.
A wall 9 m long, 6 m high and 20 cm thick, is to be constructed using bricks of dimensions 30 cm, 15 cm, and 10 cm. How many bricks will be required?
Opposite faces of a cuboid are ______ in area.
