Answer:
<u>9 parts</u> of beans and <u>12 parts</u> of ground beef is in the chilli.
Step-by-step explanation:
Given:
In a pot of chilli, there are 3 parts of beans to every 4 parts of ground beef.
If a total of 21 combined parts we're used to make.
Now, to find each ingredients is in the chilli.
As, given there are 3 parts of beans to every 4 parts of ground beef.
Let the beans be 
And the ground beef be 
Total combined parts = 21.
Now, to get the each ingredients we solve an equation:


<em>Dividing both sides by 7 we get:</em>

<em>The beans = </em>
<em />
<em>The ground beef</em> =
.
Therefore, 9 parts of beans and 12 parts of ground beef is in the chilli.