Answer:
200 students ride the bus to and from school
Explanation:
Let
x ----> the total of students
y ----> the number of students that rode the bus to school
z ----> the number of students that rode the bus to home
we know that

3/5 of the students rode the bus to school
so

substitute the value of x

Of those students, 2/3 of them ride the bus home
so

substitute the value of y

therefore
200 students ride the bus to and from school