SOLUTION: Jan can write a program in 9 days, if Dan helps her it takes 6 days. How long does it take Dan to write it by himself? The answer is 18. I believe X is 3 but I can't seem to put
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Question 396471: Jan can write a program in 9 days, if Dan helps her it takes 6 days. How long does it take Dan to write it by himself? The answer is 18. I believe X is 3 but I can't seem to put it in an equation. Answer by richard1234(7193) (Show Source):
You can put this solution on YOUR website! In one day Jan can write 1/9 of the program, and in one day Jan and Dan can write 1/6 of the program. Subtracting, we see that Dan can write 1/18 of the program in one day, so it takes 18 days for him to write it by himself.
