The radii of two cylinders are in the ratio 2 : 3 and their curved surface areas are in the ratio 5 : 3. What is the ratio of their volumes? दो बेलनों की त्रिज्यायें 2 : 3 के अनुपात में है, और उनके वक्र पृष्ठीय क्षेत्रफल का अनुपात 5 : 3 है। उनके आयतनों का अनुपात क्या है?

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