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A cylindrical jar of radius 6cm contains oil. Iron sphere each of radius 1.5cm are immersed in the oil. How many spheres are necessary to raise level of the oil by two centimetress?

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Given that radius of a cylindrical jar (r) = 6 cm 

Depth/height of cylindrical jar (h) = 2 cm

Let no of balls be ‘n’

Volume of cylindrical jar is equal to sum of volume of n spheres

Equating (1) and (2)

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