Final answer:
To determine how many students have blue eyes, multiply 2/5 by the total number of students, which is 25, resulting in 10 students with blue eyes.
Step-by-step explanation:
To find out how many students in a class of 25 have blue eyes when 2/5 of them do, you simply need to calculate 2/5 of 25. This is a basic proportion problem in mathematics, which often occurs in middle school curricula. The calculation is straightforward: multiply the total number of students by the fraction representing those with blue eyes.
Step 1: Write down the fraction of students with blue eyes, which is 2/5.
Step 2: Next, multiply this fraction by the total number of students in the class to find the number of students with blue eyes.
So you have (2/5) * 25 = 10
10 students in the class have blue eyes.