Hey there!
For this question, you just need to use context to help you in the answer.
We know that there has to be a 25:2 ratio, and that there are 245 students in the school. x= teachers y=students
We know that the boundary for number of students should be less than or equal to y.
y≥245 (the equation for this is the same for every answer)
So, the hard part is finding the ratio for the students to teachers.
We have 2y≥25x 2y≤25x 25y≤2x and 25y≥2x
We know that we can eliminate the answer choices that have the wrong variables in front of them. Number 1 is out, because x is the teachers. Number 2 is out for the same reason.
We also know that the school has to have no fewer than 2 teachers per 25 students, so you can have more teachers than necessary but no more students than necessary.
The best answer would be 25y≤2x and y≥245.
I hope this helps!
~kaikers
