Harrison Elementary School is overcrowded with 1590 students, so 40% of the students are going to move to a new school. There are 3 grade levels, and each grade level needs one 20-person advanced class and the rest of the students divided evenly into 6 additional classes. How many students will there be in each normal class at the new school?
First find how many students go to the new school: 1590 students * .4 = 
<gadget id="calculator">1590*.4</gadget>
<output>636</output>
636 students.
Then divide that number by 3 to find how many students are at each grade level: 636 students / 3 grades = 
<gadget id="calculator">636/3</gadget>
<output>212</output>
212 students/grade.
Then subtract the 20 students in the gifted class: 212 students - 20 students = 
<gadget id="calculator">212-20</gadget>
<output>192</output>
192 students.
Then divide that number by 6 to find the number of students in each other class: 192 students / 6 classes = 
<gadget id="calculator">192/6</gadget>
<output>32</output>
32 students/class.

<result>32</result>