Hi,

The weight of a synthetic ball varies directly with the cube of it radius. 

A ball with a radius of 2 inches weighs 1.20 pounds. 

Find the weight of a ball of the same material with a 3 inch radius.

     |Cross Multiplying to solve

  8x = 27*1.2

    lb

 = 4.05 lb   Thank You.

  

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