Question

If it cost rupees 2200 to paint the inner curved surface of a cylinder atrupees 20 per metre square find its inner curved surface area also find also find the height of the cylinder if the radius of cylinder is 7

Answer 1

inner surface area=cost/rate

area=2200/20

area=110m^2

surface area=2×22/7×7×h

110= 2×22×h

110/2×22=h

2.5m=h

hope you understand......