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The question asks to find the total number of students at Ridgewood Junior High School. Here's the important information from the problem:

- 20% of students brought their lunch.
- 39 students brought their lunch.

We can set up a proportion to find the total number of students in the school.

Let \( x \) be the total number of students. Since 20% (or \( \frac{20}{100} \)) of the total students equals 39 students, the equation is:

\[
\frac{20}{100} \times x = 39
\]

Now, solve for \( x \).

First, multiply both sides by 100 to get rid of the fraction:

\[
20x = 39 \times 100
\]

\[
20x = 3900
\]

Next, divide both sides by 20:

\[
x = \frac{3900}{20} = 195
\]

So, there are **195 students** in total at Ridgewood Junior High School.

Would you like a more detailed explanation or help with something else? Here are 5 related questions you might find useful:

1. How do you solve for percentages in other types of problems?
2. What happens when the percentage is unknown, but you know the total and a part?
3. Can you find how many students didn’t bring their lunch?
4. How would the problem change if 25% of the students brought lunch instead?
5. How can you use a different method, such as ratio reasoning, to solve this?

**Tip**: When solving percentage problems, always check if converting the percentage to a fraction helps simplify the equation!

All students in Ridgewood Junior High School either get their lunch in the school cafeteria or brought it from home on Tuesday. 20% of students brought their lunch. 39 students brought their lunch. How many students in total are in Ridgewood Junior High School?

Learn how to calculate the total student population of Ridgewood Junior High School using the percentage of students who brought lunch. This problem applies the percentage and proportion formulas effectively, suitable for middle school students learning basic algebra.

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