A cylindrical tub of radius 12 cm cont...

A cylindrical tub of radius 12 cm contains water to a depth of 20 cm. A spherical ball is dropped into the tub and the level of the water is raised by 6.75 cm. Find the radius of the ball.

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Increase in volume of water is solely attributed to the volume of the ball
`pir^2/_\h=4/3pir^3`
`12^2(6.75)=4/3r^3`
`r=9cm`

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