Not exactly sure which equation you meant:
3(100-b)=6b
300-3b=6b
300=9b
b= about 33
100-3b=6b
100=9b
b=about 11
If i'm correct you should add 0.5 mL to your 1 gallon tank, and I would say about 1.25 mL to your 2.5 gallon. It will not be extreme if you end up putting a little more in than you are supposed to. I'm not 100% because i haven't slept so my brain is being slow.
You need 4 Or exactly 3 and 1/3 paint cans because the area would be 1000 feet
You would put in 12 for x since there are 12 months in a year. Then you would multiply 12 by 35, and add 70.
