Final answer:
To find the number of students in the marching band, you can set up a proportion using the given information and solve for the total number of students.
Step-by-step explanation:
To determine the number of students in the marching band, we can set up a proportion using the given information. We know that 55% of the students in the marching band plan to go to the school dance, and there are 110 students going to the dance. Let x represent the total number of students in the marching band.
55/100 = 110/x
Cross multiplying, we get 55x = 11000. Dividing both sides by 55, we find that x = 200. Therefore, there are 200 students in the marching band.