9x-30 I’m pretty sure!
We are finding the difference, which means subtract! Nine times a number would be 9x and since it’s difference you would subtract it by 30.
Answer:
12 students
Step-by-step explanation:
Given
![Students = 54](https://tex.z-dn.net/?f=Students%20%3D%2054)
Required
Determine the number of students that eat lunch once a week
In Sets;
If out of 9, at least 7 eats one a week then
9 - 7 eats lunch once a week
![9 - 7 = 2](https://tex.z-dn.net/?f=9%20-%207%20%3D%202)
<em>In other words;</em>
2 out of 9 students eat lunch once a week
Number of students in this category is then calculated as thus;
![Number = \frac{2}{9} * 54](https://tex.z-dn.net/?f=Number%20%3D%20%5Cfrac%7B2%7D%7B9%7D%20%2A%2054)
![Number = \frac{2 * 54}{9}](https://tex.z-dn.net/?f=Number%20%3D%20%5Cfrac%7B2%20%2A%2054%7D%7B9%7D)
![Number = \frac{108}{9}](https://tex.z-dn.net/?f=Number%20%3D%20%5Cfrac%7B108%7D%7B9%7D)
![Number = 12](https://tex.z-dn.net/?f=Number%20%3D%2012)
210/35% in the calculator it’s 135.50