SOLUTION: Problem The instructor has learned that for the 30 students in her afternoon class, the ratio of student who do not own a computer to those who do is 2 to 1. How many students i

Algebra ->  Percentages: Solvers, Trainers, Word Problems and pie charts -> SOLUTION: Problem The instructor has learned that for the 30 students in her afternoon class, the ratio of student who do not own a computer to those who do is 2 to 1. How many students i      Log On


   

Question 228194: Problem
The instructor has learned that for the 30 students in her afternoon class, the ratio of student who do not own a computer to those who do is 2 to 1. How many students in the class own their own computer?
Answer by user_dude2008(1862) About Me  (Show Source):
You can put this solution on YOUR website!
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