Book Maths Puzzle

A garrison of 500 persons had provisions for 27 days. After 3 days a reinforcement of 300 persons arrived. For how many more days will the remaining food last now?

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Book Other Question

A hostel had provisions for 250 men for 40 days. If 50 men left the hostel, how long will the food last at the same rate? 9 examiners can examine a certain number of answer books in 12 days by working 5 hours a day. How many hours in a day should 4 examiners work to examine twice the number of answer books in 30 days?