SOLUTION: Fran can write a computer program in 9 days. if Doug helps her, they can write the program in 6 days. How long would it take Doug to write the problem by himself.

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Fran can write a computer program in 9 days. if Doug helps her, they can write the program in 6 days. How long would it take Doug to write the problem by himself.      Log On


   

Question 602571: Fran can write a computer program in 9 days. if Doug helps her, they can write the program in 6 days. How long would it take Doug to write the problem by himself.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
1/9+1/x = 1/6

6x+54 = 9x

54 = 9x-6x

54 = 3x

54/3 = x

18 = x

x = 18

So it will take Doug 18 days to write the program by himself.