There are 400 students in a local high school. 50 percent are freshmen or sophomores.  1/5 of freshmen and sophomores own a pet.  How many freshmen and sophomores do not own a pet?
Freshman/Sophomores:400(.50)=200 students
Have pets:200/5=<<200/5=40>>40 students
200-40=<<200-40=160>>160 do not have pets
#### 160