A teacher buys a ruler for \( \$ 3.00 \) and a book for \( \$ 12.00 \) for each student in their classroom. The teacher spends a total of \( \$ 300.00 \) for all of the rulers and books. How many students are in the teacher's class? students

To find the number of students in the teacher's class, we can set up an equation based on the costs of the rulers and books. Each student receives one ruler and one book. Thus, for each student, the cost is \( 3 + 12 = 15 \) dollars. The total expenditure for all students is \( 300 \) dollars. We can now divide the total cost by the cost per student: \[ \text{Number of students} = \frac{\text{Total Cost}}{\text{Cost per Student}} = \frac{300}{15} = 20 \] So, there are 20 students in the teacher's class.