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Vol. of hemisphere=  \frac{2}{3} 
 π r³
  \frac{2}{3}  π (r₁)³:  \frac{2}{3}  π (r₂)³
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Volume is ⅔πr³
so ⅔πr1³: ⅔πr2³=27:125
r1: r2 = 3:5

Ans. 3:5
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