The diameter of a right circular cone is 14 m and its slant height is 12 m. Find the cost of colouring its total surface at the rate of 14 paise per sq. m.
The dimensions of a field are 20 m by 9 m. A pit 10 m long, 4.5 m wide and 3 m deep is dug in one corner of the field and the earth removed is evenly spread over the remaining area of the field. What will be the rise in the height of the field as a result of this operation?
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A cubic metre of gold piece is hammered so that its area extends to cover an area of 6 hectares. Find thickness of the gold piece.
A cylindrical cistern of radius 42 cm is partly filled with water. If a rectangular block measuring 24 cm × 21 cm × 11 cm is wholly immersed in the water, by how much will the water level rise?
A reservoir in the shape of a rectangular parallelepiped is 20 m long. If 18 kl of water is removed from the reservoir, the water level goes down by 15 cm. Find the width of the reservoir.
A cube with edge 2 cm has spheres, each of radius 1 cm, at each vertex with vertices as the centres of the spheres. What will be the radius (in cm) of the largest sphere that can be centred within the cube and which touches each of the remaining spheres externally in at most one point?
A hollow sphere has the outer radius of 10 cm. If the volume of the hollow sphere is 76π/3, find its approximate inner radius.
A covered wooden box has the inner measures as 115 cm, 75 cm and 35 cm, and the thickness of wood is 2.5 cm. Find the volume of wood.
If one cubic centimetre of cast iron weighs 21 gm, find the weight of a cast iron pipe of length 1 metre with a bore of 3 cm and thickness 1 cm.
The volume (in cm3) of the greatest sphere that can be cut-off from a cylindrical log of wood of base radius 1 cm and height 5 cm is