The ratio of the number of students who do bring their lunch to the number of students who do not is 300 : 600 or 1 : 2
Ratio shows the relationship that exists between values. It shows the proportion of one value in another value.
In other words, ratios says how much of one thing there is compared to another thing.
The middle school has 900 students.
1/3 of the students bring their lunch instead of buying lunch at school.
Therefore,
number of students that bring lunch instead of buying lunch = 1 / 3 × 900 = 300
Number of student that buy there lunch = 900 - 300 = 600
Hence,
The ratio of the number of students who do bring their lunch to the number of students who do not is 300 : 600 or 1 : 2
learn more on ratios here:https://brainly.com/question/732937
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