Answer:
The answer is 25 if you need to understand how I got he answer let me know and I will explain
Step-by-step explanation:
A. because divide both side by -5 and reverse the sign because you divided
So, how much acid is there in 6 gallons? well is 20% acid or (20/100), so the amount of acid in it just (20/100) * 6 or 1.2, the rest is say water.
now, if we want a 90% solution, and say we add "y" gallons, how much acid is in it? well (90/100) * y, or 0.9y.
now let's add "x" gallons of pure acid, now, pure acid is just pure acid, so is 100% acid, how much acid is there in it? (100/100) * x, or 1x or just x.
we know whatever "x" and "y" amounts are, they -> x + 6 = y
and we also know that x + 1.2 = 0.9y
8oz=1cup
16cup=1gal
so
16*8=128oz per gallon
13oz/min
alrighty
13oz=13/128gal
1min=1/60hr
(13/128gal)/(1/60hr)=(13/128gal)(60hr/1)=78hr/128gal
128gal/78hr=64gal/39hr≈6.09375
about 6 gallons per hour
16 ≤ 2x - 4 is the answer