Answer:
5
Step-by-step explanation:
The greatest possible value of x is the one that makes the two unknown sides have a total of 20 (cm).
x + 3x = 20
x = 20/4 = 5
A triangle with x actually equal to 5 will look like a line segment. However, we recognize the answer value is a rounded value, so x may round to 5, but actually be shorter.
The greatest possible value of x is 5.
