To find out how many sausages Edgar needs, we can use the ratio of eggs to sausages, which is 3:2.
Given that he is using 12 eggs, we can set up the following proportion:
\[ \frac{ \text{eggs}}{ \text{sausages}} = \frac{3}{2} \]
Let \( s \) be the number of sausages. Then we have:
\[ \frac{12}{s} = \frac{3}{2} \]
Now, we can cross-multiply to solve for \( s \):
\[ 12 \cdot 2 = 3 \cdot s \]
This simplifies to:
\[ 24 = 3s \]
Now, divide both sides by 3:
\[ s = \frac{24}{3} = 8 \]
Therefore, Edgar needs 8 sausages.