A metal ball of density 7800" kg"//m^(3)...

A metal ball of density `7800" kg"//m^(3)` is suspected to have a large number of cavities. It weighs `9.8` kg when weighed directly on a balance and `1.5`kg less when immersed in water. The fraction by volume of the cavities in the metal ball is approximately

0.2

0.3

0.16

0.11

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