Radius of a cone is decreased by 40% whereas its height is decreased by 50%. Find the ratio of their volumes. शंकु के त्रिज्या में 40% की कमी की गयी जबकि इसकी ऊंचाई में 50% की कमी की गई है। उनके आयतन का अनुपात ज्ञात कीजिये।

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