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Find out from your grandparents or other...

Find out from your grandparents or other elders -
How did they get water for their daily needs when they were young ?

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A vessel is in the form of an inverted cone.Its height is 8 cm and the radius of its top,which is open,is 5 cm.It is filled with water up to the brim.When lead shots,each of which is a sphere of radius 0.5 cm are dropped into the vessel,one-fourth of the water floes out.Find the number of lead shots dropped in the vessel.