15 men can do a piece of work in 210 days. but at the end of every 10 days 15 additional men are employed , in how many days will it be finished
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in 60 days it will finish
work done=3150 or 15×210 units
so
3150=10(15+30+45+60+75+90)
which is 60 days
work done=3150 or 15×210 units
so
3150=10(15+30+45+60+75+90)
which is 60 days
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