Advertisements
Advertisements
प्रश्न
Find the cost of sinking a tubewell 280 m deep, having diameter 3 m at the rate of Rs 3.60 per cubic metre. Find also the cost of cementing its inner curved surface at Rs 2.50 per square metre.
Advertisements
उत्तर
Cost of sinking a tube well = Volume of the tube well x Cost of sinking a tube well per cubic metre
= `22/7` x (1.52) x (280) m3 x Rs 3.6/m3 = Rs 7128.
Cost of cementing = Inner surface area of the tube well x Cost of cementing per square metre = ((2 x `22/7` x 1.5x 280) m2) x Rs 2.5/m2 = Rs 6600
APPEARS IN
संबंधित प्रश्न
What will happen to the volume of a cube, if its edge is trebled?
Suppose that there are two cubes, having edges 2 cm and 4 cm, respectively. Find the volumes V1and V2 of the cubes and compare them.
Find the volume of a cube whose surface area is 96 cm2.
A metal cube of edge 12 cm is melted and formed into three smaller cubes. If the edges of the two smaller cubes are 6 cm and 8 cm, find the edge of the third smaller cube.
Find the length of 13.2 kg of copper wire of diameter 4 mm, when 1 cubic cm of copper weighs 8.4 gm.
The dimensions of a rectangular box are in the ratio 4: 2 : 3. The difference between the cost of covering it with paper at Rs. 12 per m2 and with paper at the rate of 13.50 per m2 is Rs. 1,248. Find the dimensions of the box.
The ratio between the lengths of the edges of two cubes is in the ratio 3: 2. Find the ratio between their:
(i) total surface area
(ii) volume.
If the ratio of the sides of two cubes are 2 : 3, then ratio of their surface areas will be
If the length of the diagonal of a cube is `6sqrt(3)` cm, then the length of the edge of the cube is 3 cm.
A cube of side 5 cm is painted on all its faces. If it is sliced into 1 cubic centimetre cubes, how many 1 cubic centimetre cubes will have exactly one of their faces painted?
