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.
:
Working together for one day:
{{{1/x}}} + {{{1/(2x)}}}
as a single fraction
{{{(2 + 1)/(2x)}}} = {{{3/(2x)}}} 
:
 Evaluate the expression for "x = 5
Replace x with 5 in the above fraction
{{{3/(2*5)}}} = {{{3/10}}} completed in 1 day together