At Mountain Park Middle School, there are 250250 seventh-grade students. Currently, 32\%32% of those students are in advanced math.

a. ​​ Write an equation to represent the number of seventh-grade students who are not in advanced math. Let a represent the number of seventh-grade students who are not in advanced math.

​ a=a=
\% \ \times% ×


​

​​b. There are
seventh-grade students who are not in advanced math.