The first time they took out of liters of oil are:
56: 4 = 14 (l) Number of liters of oil remaining after the second take is: 56-14 = 42 (l) Second liters of oil extracted is: 42: 3 = 14 (l) In-liter barrel of oil remaining is: 56 - (14 + 42) = 28 (liters) Answer: 28 liters
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