A farmer can reap a field in 10 days while his wife can do it in 8 days. If they work together, in how much time can they reap the field?
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take hcf of the farmer and his wife
hcf of 8 and 10
(8)=2*2*2
(10)=2*5
hcf=2
hcf of 8 and 10
(8)=2*2*2
(10)=2*5
hcf=2
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