A farmercan rupa field in 20 days while his wife can do it in 30 days. If they work together,
how much time can they reap the field?
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Answer:
farmer=30 days
wife=20 days
take lcm=60 days(total work)
efficiency= total work/ days
farmer=60/30=2
wife=60/20=3
total days=total work/total efficiency
=60/5
=12 days
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