900 students attend Ridgewood Junior High School. 25% of students bring their lunch to school everyday. How many students brought their lunch to school on Thursday?

25% of 900 students is 0.25 * 900 = 225 students brought their lunch to school on Thursday.

All students in Ridgewood Junior High School either get their lunch in the school cafeteria or brought it from home on Tuesday. 25% of students brought their lunch. 50 students brought their lunch. How many students in total are in Ridgewood Junior High School?

Let x be the total number of students in Ridgewood Junior High School.

We are given that 25% of students brought their lunch, which is 0.25x students. We are also given that 50 students brought their lunch.

So we can write the equation:

0.25x = 50

Solving for x:

x = 50 / 0.25
x = 200

There are a total of 200 students in Ridgewood Junior High School.