Question 275763
Longest=4s
Middle=2s-6
l+m+s=78
4s+2s-6+s=78
7s=78+6
7s=84
s=84/7
s=12 ft. for the shortest piece.
l=4*12=48 ft. for the longest piece.
m=2*12-6=24-6=18 ft. for the middle piece.
Proof:
12+48+18=78
78=78