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प्रश्न
72 men do a piece of work in 25 days. In how many days will 30 men do the same work?
उत्तर
Men: Days:: Men : Days
72 : 25 :: 30 : x
∴ By inverse proportion
72 × 25 = 30 × x
`⇒"x"=(25xx72)/30`
= 60 days
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