Question

a container open at the top is in the form of frustum of coneof height 24 cm with radii of its lower and upper ends as 8 cm and 20 cm respectively find the cost of milk which can completely fill the container at the rate of rs 20 per litre

Answer 1

Radii of the container in the form of frustum of a cone = 8 cm and 20 cm

Height of the container = 24 cm

Volume of the milk filled in the container = (1/3) π h (r12 + r22 + r1r2)
                                                          = (1/3) (22/7) (24) (82 + 202 + 8x20)
                                                          = (1/3) (22/7) (24) (64 + 400 + 160)   
                                                          = 15689.1 cu cm

1 cubic centimeter = 0.001 litre
15689.1 cu cm = 15.689 litres
Cost of milk per litre = Rs 20

Total cost = 15.689 x 20 = Rs 313.78

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Answer 2

Answer:

this answer is taken from

GRADEUP SCHOOL