Posted by **angad** on Tuesday, December 11, 2012 at 9:15am.

if 16 men can build a road of 9 km in 3 days then how many men can build 21 km road in 5 days.

- maths --plse help me.. -
**Steve**, Tuesday, December 11, 2012 at 10:22am
we have

9km/(16men*3days) = 3/16 km/man-day

so, you conversion factor is

16/3 man-day/km

so, with 21km and 5 days, you will need

16/3 man-day/km * 21km / 5day = 22.4 men

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