A room is 15m long, 4m broad and 3m height. Find the cost of white washing its four walls at 50p per m² ?

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The radius of a cylinder is 2 r units and height is 3 r units. Find the curved surface?

A. 18 πr2 sq units B. 3 πr2 sq units C. 12 πr2 sq units D. 6 πr2 sq units...

The spherical ball of lead 3 cm in diameter is melted and recast into 3 spherical balls. The diameters of two of these are 1 ½ cm and 2 cm respectively. The diameter of third ball is?

A. 2.66 cm B. 2.5 cm C. 3 cm D. 3.5 cm...

Three cubes of metal whose edges are 9, 12 and 15 cm respectively, are melted and one new cube is made. Find the edge of the new cube?

A. 21 cm B. 19 cm C. 32 cm D. 18 cm...

A rectangular field 30 m long and 20 m broad. How much deep it should be dug so that from the earth taken out, a platform can be formed which is 8 m long, 5.5 m broad and 1.5 m high where as the earth taken out is increase by 10/5?

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The diameters of two spheres are in the ratio 1:2 what is the ratio of their volumes?

A. 3:4 B. 9:16 C. 1:8 D. 4:3...