Book Maths Puzzle Numerical Ability

371+445=1036
137+544=?

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Book Other Question

a cistern has a leak whick would empty in 8 hours. a tap is turned on, which fill the empty cistern 6 litres a minute. and the cistern is now empetied in 12 hours.the cistern can hold?? Some articles were bought at 6 articles for Rs. 5 and sold at 5 articles for Rs. 6. Find the gain percentage.