SOLUTION: 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 finished?

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Question 880148: 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 finished?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
One man rate, 1%2F%2815%2A210%29=1%2F%283150%29 job per day.
RT=J uniform rates for doing a job or task.

10 days____________15%281%2F3150%29%2A10=0.04762
20 days____________30%281%2F3150%29%2A10%2B15%281%2F3150%29%2A10=0.14286
30 days____________45%281%2F3150%29%2A10%2B30%281%2F3150%29%2A10%2B15%281%2F3150%29%2A10=0.2857
40 days____________60%281%2F3150%29%2A10%2B30%281%2F3150%29%2A10%2B15%281%2F3150%29%2A10=0.47619
50 days____________75%281%2F3150%29%2A10%2B30%281%2F3150%29%2A10%2B15%281%2F3150%29%2A10=0.71429
60 days____________90%281%2F3150%29%2A10%2B30%281%2F3150%29%2A10%2B15%281%2F3150%29%2A10=highlight%281%29

60 days.