Answer:
458 (or 459 if you overestimate)
Explanation:
Let's work backwards. we know that the 275 students are 60% of the total students enrolled, which we'll denote with x. Therefore:
0.6x = 275
Now divide both sides by 0.6 to get the answer:
x = 458.3
You can't have .3 students, so the answer is either 458 or 459 students, depending on if you want to over or underestimate.
Hope this helps!