24 tractors plough a field in 10 days. How long will 30 tractors take to do the same work?
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If 3 men or 4 women can plough a field in 43 days, how long will 7 men and 5 women take to plough it? a) 10 days b) 11 days c) 9 days d) 12 days.
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this is the correct answer OK
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