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Deepak Bora
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A vessel is in the form of an inverted cone. Its height is 11 cm and the radius of its top, which is open, is 2.5 cm. It is filled with water upto the rim. When some lead shots, each of which is a sphere of radius 0.25 cm, are dropped into the vessel, 2/5 of the water flows out. Find the number of lead shots dropped into the vessel.

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M.L Aggarwal book Important Question of class 10 chapter Based on Mensuration for ICSE BOARD.
A vessel is in the form of an inverted cone. Its height is 11 cm and the radius of its top, which is open, is 2.5 cm. It is filled with water upto the rim.
Find the number of lead shots dropped into the vessel.
This is the Question Number 25, Exercise 17.5 of M.L Aggarwal.

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1 Answer

  1. Given height of the cone, h = 11 cm

    Radius of the cone, r = 2.5 cm

    Volume of the cone = (1/3)r2h

    = (1/3)×2.52×11

    = (11/3)×6.25 cm3

    When lead shots are dropped into vessel, (2/5) of water flows out.

    Volume of water flown out = (2/5)×(11/3)×6.25

    = (22/15)×6.25

    = (137.5/15) cm3

    Radius of sphere, R = 0.25 cm = ¼ cm

    Volume of sphere = (4/3)R3

    = (4/3)×(1/4)3

    = /48 cm3

    Number of lead shots dropped = Volume of water flown out/ Volume of sphere

    = (137.5/15) ÷/48

    = (137.5/15) ×48/

    = 137.5×48/15

    = 440

    Hence the number of lead shots dropped is 440.

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