00:01
In order to solve this equation or this problem, we need to write a set of equations that describes it.
00:06
So i'm just going to look along and see if i can find any equations.
00:10
So we sell two types of coffee.
00:13
There's the kenyan.
00:15
I'm going to just call that k.
00:16
So k, i'm going to define as the pounds of kenyon.
00:23
Likewise, c is going to be defined as the pounds of the costa rican.
00:32
Now, we know that kenyon sells for 480 and costa sells for 680, and the customer paid 3350.
00:41
That 3350 must have come from buying some number of k plus some number of c that we're going to find.
00:50
Well, for k we paid 480, so 4 .8k plus for c we paid 6 .8.
00:58
So there's an equation that relates k and c.
01:00
If we can find another equation, then we can solve for k and c.
01:05
We also know that it's five pounds.
01:08
So if i just straight add k plus c, i should get five.
01:12
So these two equations are the key.
01:15
We can ignore everything else in this problem and just solve those equations...