Answer:
81
Step-by-step explanation:
2x+6=84
2x=78
find your own way
144'
Your ratio is 45'/5" or 9:1
9x4"=36'
9x3"=27'
45+36+36+27=144'
I believe this is the same answer as I gave previously.
as
I=PRT
SO
T=I/PR
$8