5 men can work together to finish a piece of work in 25 days. How many days will 20 men take to complete that same piece of work? [2 Marks]

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Solution

Clearly, it is a case of inverse variation.[0.5 Mark ]

Number of days 15 men take to complete the work = 25 days [0.5 Mark ]

Number of days 1 man takes to complete the work = (25 × 15) = 375 days [0.5 Mark ]

Number of days 20 men take to complete the work = 375/20 = 18.75 ≈ 19 days

∴ 20 men will take approximately 19 days to complete the work. [0.5 Mark ]

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