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maths --plse help me..

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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.. -

    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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