7 5/21 I think that would be the one that can cover it but not have to much left.
You might need a second opinion.
Answer:
wrong question ⁉️⁉️ and the ew
Answer:
Step-by-step explanation:
The first two answers could not possibly be correct.
"Skewed to the right" implies that the mean is larger than the median. This is the correct answer.
Answer:
2.5 gal would have to be replaced with 100% bleach to get the right concentration.
Step-by-step explanation:
If we drain X gal from the tank and we replace it with X gal of 100% bleach we will have in the tank: 80-X gal of 4% bleach and X gal of 100% bleach.
We can calculate the final concentration of the solution using a weighted average of the volumens where the weights are going to be the concentrations of each one:
(7%)×(80) = (4%)×(80-X) + (100%)×(X)
560 = 320-4X+100X
240 = 96X
X=2.5 gal