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A spherical lead ball of radius 10 cm is melted and small lead balls of radius 5 mm are made. The total number of possible small lead balls.?

800
125
400
8000

Correct Answer: 8000

Explanation:

Number of balls = Volume of big ball / Volume of 1 small ball
= [4/3 x π x 10 x 10 x 10] / [4/3 x π x 0.5 x 0.5 x 0.5]
= 8000

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