If 12 eggs cost $2.04, you need to figure out how much 1 egg cost. In order to do that, you need to divide the cost ($2.04) by the amount of eggs (12):
[tex] \frac{2.04}{12} = 0.17[/tex]
1 egg = 0.17
Now that we know how much 1 egg costs, we need to take that number and multiply it by 18:
[tex]0.17 * 18 = 3.06[/tex]
In this case, 18 eggs will cost $3.06.
