20 सेमी आंतरिक व्यास वाले एक पूरी तरह से भरे हुए खोखले गोले से पानी स्थानांतरित करके 1 सेमी आंतरिक त्रिज्या वाले कितने खोखले गोलों को पूरी तरह से भरा जा सकता है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?