[" A petwee tank in the form of a frustum of "],[" a cone of hight "20m" with diametive of its lown "],[" and .What ends as "20m" and "50m" resp.Eind the "],[" cost of pretree is "20m" and bile the tank.Eantlate "],[" at the rate of "R_(2)" .To plite.Also find simface "],[" area of the tank."]

A petrol tank is in the form of a frustum of a cone of height 20 m with diameters of its lower and upper ends as 20 m and 50 m respectively. Find the cost of petrol which can fill the tank completely at the rate of Rs. 70 per litre. Also find the surface area of the tank

A petrol tank is in the form of a frustum of a cone of height 20 m with diameters of its lower and upper ends as 20 m and 50 m respectively. Find the cost of petrol which can fill the tank completely at the rate of Rs. 70 per litre. Also find the surface area of the tank

The diameter and height of a cylindrical water tank are 2 m and 14 m respectively. Find the cost of painting its outer curved surface at the rate of Rs. 20 per m^(2) .

The diameter and height of a cylindrical water tank are 2 m and 14 m respectively. Find the cost of painting its outer curved surface at the rate of Rs. 20 per m^(2) .

A tent is made in the form of a frustum of a cone surmounted by anoter cone. The diametere of the base top of the frustum are 20m and 6m respectvely, and the height is 24m. If the height of the tent is 28 m and the radius of the conical part is equal to the radius of the top of the frustum, fidn the quantity of can vas required. [ Take pi = 22/7 ]

Find the cost of preparing a closed cylindrical tank of height 2.8 m and base diameter 4 m at the rate of Rs 100 per sq. m.

Find the cost of fencing a triangular garden with sides 20m, 24 m and 32 m at the rate of 142 per metre.

A pool is 20m long,15m broad and 4m deep FInd the cost of cementing its floor and its wall at the rate of Rs.12 per square metre.

Water tank is made of iron sheet. Its dimensions are 4m times 3m times 2m .Find the cost of painting the inside of the tank at the rate of Rs 7 per square metre

Find the surface area of a frustum of a right circular cone with a slant height of 30 m, lower base radius 20 m and top radius of 15 m ?