Final answer:
The ratio of the number of students who want waffles to the number of students who want pancakes is 19 to 25, or written as 19:25 or 19/25.
Step-by-step explanation:
To find the ratio of the number of students who want waffles to the number of students who want pancakes, we divide the number of students who prefer waffles by the number of students who prefer pancakes. There are 19 students who want waffles and 25 students who want pancakes.
The ratio is therefore 19 to 25, which can also be written as 19:25 or 19/25. This ratio shows the comparison between the two preferences, indicating that for every 19 students who want waffles, there are 25 who want pancakes.