At Roosevelt high school there are 600 students in the senior class. A fifth of the students are in the marching band. Of the students in the marching band, half of them play a brass instrument. Of the students that play a brass instrument, a fifth of them play the saxophone. Of the students that play the saxophone, a third of them play the alto saxophone. How many students play the alto saxophone?
The number of students in the marching band is 600 / 5 = 
<gadget id="calculator">600/5</gadget>
<output>120</output>
120 students.
The number of students that play a brass instrument is 120 / 2 = 
<gadget id="calculator">120/2</gadget>
<output>60</output>
60 students.
The number of students that play the saxophone is 60 / 5 = 
<gadget id="calculator">60/5</gadget>
<output>12</output>
12 students.
The number of students that play the alto saxophone is 12 / 3 = 
<gadget id="calculator">12/3</gadget>
<output>4</output>
4 students.

<result>4</result>