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A plastic drum of cylindrical shape is made by melting spherical solid plastic ball of 1 cm radius find the no of balls required to make a drum of

thickness 2 cm height 90 cm and outer radius is 30 cm


Here is the solution , sorry for the bad handwriting
0 0 0
umm , I'm sorry but my answer is wrong , please guys correct it
ya the answer is wrong actually i know answer but i m confused whether to take the upper radius or lower 
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