Hi,
The sum of the smallest and medium sides is 98 cm more than the longest side
The difference of the longest side and shortest sides is 44 cm
Let (x + 44), (x),[(x+44) + 98 -x] represent long, short and medium side lengths respectively
Question states***
(x+44) + x + 142 = 394cm
2x = 208
x = 104, dhort side, long side is 148 and medium is 142
104 + 142 + 148 = 394