While walking outside on a field trip 75%, or 27, of the students in the class wore jackets. Find the number of students in the entire class.
Let's represent the number of students in the entire class as 'x'.
According to the problem, 75% of the students, or 0.75x, wore jackets.
We know that 0.75x = 27.
To find 'x', we can divide both sides of the equation by 0.75: x = 27 / 0.75 = <<27/0.75=36>>36.
Therefore, there are 36 students in the entire class. Answer: \boxed{36}.