SOLUTION: If James does a job in 9 hours and with the help of Amber they can do it together in 2 hours, how long would it take Amber to do it alone? ___________ hours Note: Write f

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: If James does a job in 9 hours and with the help of Amber they can do it together in 2 hours, how long would it take Amber to do it alone? ___________ hours Note: Write f      Log On


   

Question 932039: If James does a job in 9 hours and with the help of Amber they can do it together in 2 hours, how long would it take Amber to do it alone?
___________ hours
Note: Write fractional answers as a fraction in lowest terms.
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
The rate for James and Amber working simultaneously is the sum of their individual rates. If x is the time for Amber to do 1 job alone, then 1%2F9%2B1%2Fx=1%2F2.

The lowest common denominator is 2%2A9%2Ax. Use elementary fraction skills and solve for x.