Using the Fundamental Counting Theorem, it is found that she can choose 180 different meals.
It is a theorem that states that if there are n things, each with [tex]n_1, n_2, \cdots, n_n[/tex] ways to be done, each thing independent of the other, the number of ways they can be done is:
[tex]N = n_1 \times n_2 \times \cdots \times n_n[/tex]
In this problem:
Then:
[tex]N = n_1n_2n_3 = 3(15)(4) = 180[/tex]
She can choose 180 different meals.
To learn more about the Fundamental Counting Theorem, you can take a look at https://brainly.com/question/24314866