The radii of the internal and the external surfaces of a hollow hemispherical shell are in the ratio 3/5 If it is melted and recast into a hollow cylinder with the same radius of the internal and external surfaces as that of the hollow hemispherical shell, then the ratio of the height of the hemispherical shell to the height of the hollow cylinder is
a. 3:5
b. 60:49
c. 36:49
d. 18:49
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maybe the correct option should be ( a ) 3:5
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