Find the cost of plastering the inner surface of a well at Rs. `9. 50\ p e r\ m^2,` if it is 21m deep and diameter of its top is 6m.

How many cubic metres of earth must be dogout to sink a well 21m deep and 6m diameter? Find the cost of plastering the inner surface of the well of Rs. 9. 50\ p e r\ m^2dot

Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m.

Find the total surface area of a cone, if its slant height is 21 m and diameter of its baseis 24 m.

Find the cost of painting at the rate of Rs. 5.60 per m^(2) on the hemispherical dome of diameter 10 m.

The cross-section of a railway tunnel is a square surmounted by a semi-circle as shown in the figure. The tunnel is 50 m long. Find the cost of plastering the internal surface of the tunnel (excluding the floor) at the rate of Rs 10 per m^(2).

The length of a room is one and a half times its breadth. The cost of carpeting the room at R s .3.25\ p e r\ m^2\ i s\ R s .175.50 and the cost of papering the walls at R s .1.40\ p e r\ m^2i s\ R s .240.80 . If 1 door and 2 window occupy 8\ m^2, find the dimensions of the room.

The length of a room is one and a half times its breadth. The cost of carpeting the room at R s .3.25\ p e r\ m^2\ i s\ R s .175.50 and the cost of papering the walls at R s .1.40\ p e r\ m^2i s\ R s .240.80 . If 1 door and 2 window occupy 8\ m^2, find the dimensions of the room.

It costs Rs. 2200 to paint the inner curved surface of a cylindrical vessel 10m deep. If the cost of painting is at the rate of R s .20\ p e r\ m^2, find: radius of the base inner curved surface area of the vessel capacity of the vessel

The cross-section of a railway tunnel is a rectangle 6 m broad and 8 m high surmounted by a semi-circle . The tunnel is 35 m long. Find the cost of plastering the internal surface of the tunnel (excluding the floor) at the rate of Rs 2.25 per m^(2)

The cost of levelling and turfing a square lawn at Rs 2.50 per m^2 is Rs 13322.50. Find the cost of fencing it at Rs 5 per metre.