Math, asked by csroy2015, 9 months ago

A petrol tank is in the form of a frustum of a cone of height 20 m diameter of its lower and upper ends as 20m and 50m .find the cost of petrol which can fill the tank completely Rs 70 per litre .also find the surface area of the tank

Answers

Answered by nithishsai2004

Height of cone = 20m

Diameter of lower end = 20m , r = 10m

Diameter of upper end = 50= 25m

Cost per litre = 70rs

Volume of lower cone = 1/3pi*r^2h

1/3*22/7*10*10*20=44000/21m^3

Volume of cube with upper cone = 1/3pi*r^2h

= 1/3*22/7*25*25*20

=275000/21m^3

Add both the volumes , you will get volume of complete cube

44000/21+275000/21 = 319000/21

Cost for filling petrol = 319000/21*70

= rs 7443333.33

Answered by Velentinachongtham07

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