Question 30746
Let the shortest piece be x
Let the middle piece be 2x-6
Let the longest piece be 4x
Equation:
<pre><b>(x)+(2x-6)+(4x)=78
7x=84
x=12

2(12)-6=18
4(12)=48


<font color = red>Hence, the 3 pieces are 12ft, 18ft, and 48ft.</font>
Paul.