Answer:
➩ The third side is 16x units. 
Step-by-step explanation:
<u>Given</u><u> </u><u>that</u>,
- Perimeter of a ∆ is 41x 
- It's two sides are : 18x and 7x
We need to find the third side in terms of x 
<u>We</u><u> </u><u>know</u><u> </u><u>that</u>, 
Perimeter of the ∆ = Sum of all sides 
<u>Therefore</u>, 
We can say that, 
➡ 41x = 18x + 7x + third side 
➡ 41x = 25x + third side 
➡ 41x - 25x = third side 
➡ 16x = third side 
<u>Hence</u>,
The third side is 16x units.