Explanation
To determine the fraction of boys in the history class when there are 12 boys and 18 girls,
we can follow these steps:
1. Calculate the total number of students in the class:
Total number of students = 12 boys + 18 girls = 30 students
2. Find the fraction of boys in the class:
Fraction of boys = Number of boys / Total number of students
= 12 boys / 30 students
= 2/5