Question 1077325: Mark can harvest the crops in 9 days. His father needs 15 days to complete the same task. If Mark works on the first day, his father works on the second day, Marks works again on the third day, his father works on the fourth day, and so on, how many days does it take to harvest 4/5 of the crops?
Answer by jorel1380(3719)   (Show Source):
You can put this solution on YOUR website! If Mark can harvest the crops in 9 days, he does 1/9th of the harvesting per day. Likewise, his father does 1/15th of the harvesting. In two days, they do 1/9th and 1/15th, or 8/45th of the work. So:
(4/5)/(8/45)=4/5*45/8=9/2
9/2*2 days=9 days to harvest 4/5th of the crops, alternating work days. ☺☺☺☺
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