twenty percent of the students at a school bring their lunches from home. 200 students do not bring their lunch. How many students attend the school?

Question

I dont know how to do this and I need it step by step

Answer 1

Let the number of students who attend the school = x

Let the number of students who bring lunch = 0.20x
Let the number of students who do not bring their lunch = 200

 

We set up the equation

 

 

200 + 0.20x = x

 

0.20x - x = -200

-0.80x = -200

        x = 250

 

There are 250 students who attend the school.