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Question
If 30 men can reap a field in 15 days, then in how many days can 20 men reap the same field? (using unitary method)
Solution
30 men can reap a field in 15 days.
∴ 1 men can reap the field in `15/30` days = `1/2` days.
∴ 20 men can reap the field in = `1/2 xx 20` = 10 days
∴ 20 men can reap the field in 10 days.
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