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Eighteen Fifty Seven was written by well known Indian Historian Dr. Surendra Nath Sen ,with a foreword by Maulana Azad. It was published on May 1957 by the publication division, Ministry of Information and broadcasting, Government of India.
A and B together can complete a work in 12 days, and B alone can complete it in 20 days. How many days will A take to complete the work alone?