Use proportional relationships to solve this mixture problem. The incoming 6th-grade class has a choice between band or choir as an elective. There are four times as many seats in choir as there are in band. How many students can choose band if there is a total of 250 students?
1. 124 students
2. 250 students
3. 200 students
4. 50 students
Let's denote the number of seats in band as "x" and the number of seats in choir as "4x" (since there are four times as many seats in choir as there are in band).
According to the problem, the total number of students is 250. So we can set up the following equation:
x + 4x = 250
5x = 250
x = 50
Therefore, there are 50 seats in band. Thus, the answer is 4. 50 students can choose band.