an oil extracting machines working 10 hours a day, produces 30 drums of oil in 24 days. How many hours per day did the machine work to produce 180 drums of oil in 72 days ?
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The machine worked 20 hours a day
because in 10 hours a day for 24 days it produced 30 drums therefore if it worked 10 hours a day for 72 days it would 30 into 3 which is 90. 180 is double of 90 hence if we double the amount of work hours then produced amount also doubles
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An oil extractor works 12 hours a day and produces 30 drums of oil in 16 days. How many hours do you have to work every day to extract 180 drums of oil in 72 days?
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