1. The problem states there are 12 boys and 18 girls in a class. We need to find the fraction of boys in the class. 2. Calculate the total number of students: $$12 + 18 = 30$$. 3. The fraction of boys is the number of boys divided by the total number of students: $$\frac{12}{30}$$. 4. Simplify the fraction by dividing numerator and denominator by their greatest common divisor, which is 6: $$\frac{12 \div 6}{30 \div 6} = \frac{2}{5}$$. 5. Therefore, the fraction of boys in the class is $$\frac{2}{5}$$.