Using subtraction (-) and addition (+) operations alternately, which pair of numbers will replace the question mark (?) to logically complete the series below? 20, 16, 24, 20, 28, ?, ?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?