6 days 15 hours minus 3 days 20 hours equal 2 days 19 hours.
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35 hours because if he worked 5 hours for 3 days, 5x3 = 15 and if he worked 20 hours the previous week, 15+20=35.
8/15 minus 7/20 is 11/60
8 hours minus 2 hours and 20 minutes is equal to 5 hours and 40 minutes.
20 + 15 - 3 = 32
24÷20=083333 20 hours = .83333 days