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
C. G is both the midpoint
Take 220.28 and subtract 126.53 to get 93.75. This 93.75 is equal to e hours of labor. So if you knew that they worked on the car say for 2 hours you would divide 93.75 by two, if three hours divide by three and so on. If they worked on the car for one hour as we can assume. The mechanic charges $93.75 per hour.
Answer:
Step-by-step explanation:
VERY EASY