SOLUTION: Melanie can paint a barn in "x" days. Melissa can do it in "2x" days Write a rational expression for the fraction of the barn That they complete in one day by working together. Eva

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Melanie can paint a barn in "x" days. Melissa can do it in "2x" days Write a rational expression for the fraction of the barn That they complete in one day by working together. Eva      Log On


   

Question 225151: Melanie can paint a barn in "x" days. Melissa can do it in "2x" days Write a rational expression for the fraction of the barn That they complete in one day by working together. Evaluate the expression for "x = 5"
I have no idea how to write the rational expression.
Thank you very much.
Carmelita Haynes
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Melanie can paint a barn in "x" days. Melissa can do it in "2x" days
Write a rational expression for the fraction of the barn That they complete in one day by working together.
:
Working together for one day:
1%2Fx + 1%2F%282x%29
as a single fraction
%282+%2B+1%29%2F%282x%29 = 3%2F%282x%29
:
Evaluate the expression for "x = 5
Replace x with 5 in the above fraction
3%2F%282%2A5%29 = 3%2F10 completed in 1 day together