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/manday
so, you conversion factor is
16/3 manday/km
so, with 21km and 5 days, you will need
16/3 manday/km * 21km / 5day = 22.4 men
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