The problem solving is on the image, 6th grade

So when you are using ratios you can simplify them, just like fractions. So when you simplify 15:330 you can divide both numbers by 15 and get 1:22. So this means for every teacher there are 22 students. So you should multiply 23 by 22 to get answer B, you need to divide 550 by 22 to get answer c, and you need to multiply 36 by 22 to get answer D. Could you mark branliest? Let me know if I helped!

The answer should be 5.