1.

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 canfill the tank completely at the rate of Rs. 70 per litre.​

Answer»

tion:volume of FRUSTRUM = 1/3pi*h*(r1^2-r2^)= 1/3*22/7*20*(25^2-10^2)= 1/3*22/7*20*35*15= 22*20*5*5m3= 22*20*5*5/1000 LITRE= 11 litrestotal cost = 70* 11= 770 rs



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