Answer :
To find the total number of sweets, let's start by understanding the problem. We have 125 students in the class, and each student received an amount of sweets equivalent to 20% of the total number of students.
First, calculate 20% of the total number of students:
[tex]0.20 \times 125 = 25[/tex]
This means each student received 25 sweets.
Since there are 125 students, to find the total number of sweets given out to all the students, we multiply the number of sweets each student received by the total number of students:
[tex]25 \times 125 = 3125[/tex]
So, the total number of sweets is 3125.
Therefore, the correct answer is the second option: 2. 3125.
It's important to understand that the problem involves calculating percentages and then multiplying to find a total, which is a common approach in solving such type of problems.