A mixture of ethanol and water in a container has 20% ethanol. In another container, the mixture has 60% ethanol. How much quantity of the mixture from the second container must be added to 45 litres of the mixture from the first container to make a final mixture containing 45% ethanol?

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?