a contractor undertook to finish a road 12 km long in 350 days, but after employing 45 men for 200 days he found the only 4 km of road were built. How many additional men must be then engaged to finish the work in given time ?
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Answer:
75
work completed within 200 days is 4 km with 45 men.
for this total men is 45×200= 9000
for 1km 9000÷4= 2250.
rest road to be made is 12-4=8
so, total required men power is 8× 2250= 18000.
but i have 350-200= 150 days.
so, per day required men is 18000÷150= 120.
therefore, required additional men power is 150-45= 75
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