Give the step-by-step reasoning process and then the final answer. 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 = 40 students. 200 - 40 = 160 do not have pets.
The final answer: 160.