Question 228194
x=who don't
y=who do


"the ratio of student who do not own a computer to those who do is 2 to 1"----> x/y=2/1 ----> x=2y


"The instructor has learned that for the 30 students" ---> x+y=30

x+y=30
2y+y=30
3y=30
y=10     <----- First answer

x=2y --> x=2(10)=20 < ---- Second answer