Answer:
18.583
Step-by-step explanation:
I just did the math and checked my answer with a calculator
Answer:
The answer is 4 liters.
Step-by-step explanation:
We want a final 25% solution, which means that the solvent should constitute 25 percent of all the liters of solution.
Let us call
the litres of 40% solution, so when they are added to the 12 litres of 20% solution, the total litres of the new solution are:

of these liters, 25% must be the solvent:

Now for the 40% solution, the liters of the solvent are
, and for the 20% liter solution, the liters of solve are
liters. Thus the total liters
of the solvent are

Therefore


-2
1 degree ever 10mins
1 hour = 60mins
1x6
Drops 6°f
-2+-6 = -8 degrees after 1 hours