To solve this problem you must apply the proccedure shown below:
1. You have the following information given in the problem above: twice the length of the shortest side plus the length of the longest side is 248 inches.
2. Therefore, keeping on mind the information above, you have:
x: the shortest side
x+6: the longest side
2x+(x+6)=248
3x+6=248
3x=242
x=242/3
x=80.66 (The shortest side)
x+6=80.66+6=86.66 (The longest side)
The answer is: 86.66