find the perimeter of the triangle if the measures of its sides are:
x+2/4, 5x/5, 2x+1/20x
Set up a common denominator: 20x
Then add things up:
5x(x+2) + 4x(5x) + (2x+1)
-----------------------
20x
Assuming I parsed your fractions correctly... As written, without parentheses, they add up to
81x/20 + 1/2