00:01
Number 20 is a mixture problem.
00:02
So i have my framework set up here.
00:05
I'm going to put my volumes on top, my concentration on the bottom.
00:08
I'm going to leave my concentration in percentage instead of changing it to a decimal.
00:13
It works out the same.
00:14
As long as all of these are in the same unit, it works out.
00:19
So we're told that we need a 10 % solution, and we start with a 20 % solution.
00:32
We start with 60 milliliters of that.
00:35
And we want to know how much of a 5 % solution we need to add to get a 10 % solution.
00:48
So you can tell volume, if i'm adding some of this and some of this, my total is going to be that plus that.
00:54
X plus 60.
00:57
And then how these mixture are set up work is you just multiply straight down...