You can
put this solution on YOUR website! .67 = (1 - T)(.8)
It might be easier for you if you change
the right sides to
.67 = .8(1 - T)
Now to get rid of decimals, multiply both
sides by 100, which moves the decimals
two places to the right:
(100).67 = (100).8(1 - T)
67 = 80(1 - T)
67 = 80 - 80T
Add 80T to both sides
67 = 80 - 80T
+80T + 80T
-------------------
80T + 67 = 80
Add -67 to both sides
80T + 67 = 80
- 67 -67
--------------
80T = 13
Divide both sides by 80
80T = 13
---- = ----
80 80
T = 13/80
Edwin