Answer:
The answer to your question is 2s + s + 3s = 120
Explanation:
Data
total length = 120 ft
first piece = f
second piece = s
third piece = t
Process
1.- Write an equation for each piece
first piece = f
f = 2s equation 1
t = 3s equation 2
2.- Write a total equation
f + s + t = 120 equation 3
-Substitute equations 1 and 2 in equation 3
2s + s + 3s = 120
3.- Calculate the length of each side
6s = 120
s = 120/6
s = 20 ft
f = 2(20)
f = 40 ft
t = 3(20)
t = 60 ft