20 women can do a job in 20 days. After each day, a woman is replaced by a man and a man is twice as efficient as a woman. On which day does the job get completed?
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Step-by-step explanation:
day 1 - 20 women working - 1/20th of the work is done.
day 2 - 19W & 1M = 19/400+1/200 = 21/400
day 3 - 18W,1M & 1B = 18/400+1/200+1/800 = 41/800
day 4 - 17W,2M & 1B = 17/400+2/200+1/800 = 43/800
We know it will take less than 20 days as the fraction keeps increasing.
I agree with Vivian, it should be 18 days.
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