The diameters of two spheres are in the ratio 1:2.Find the ratio of their volumes?

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1. Ratio of diameters=1:2
   Ratio of radius=1:2
   Ratio of volumes=(4/3*3.14*r1^3)/(4/3*3.14*r2^3)
   =r1^3/r2^3=1^3/2^3=1/8

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