Simple proportions.
You want a 1:5 ratio.
You have a 5:1 ratio.
So you add another 24 drops of white.
5:25 = 1:5
or
5/x = 1/5 and cross multiply.
Negative, because Correlation and slope have the same direction (Sxy will be negative)
100$ because the income you have to earn is 400$, right? If so then 100 * 4 give you 400.
