Mrs. Johnson's class is at the museum for 3 hours and wants to spend $\frac{1}{4}$ of an hour at each exhibit. We need to find the number of exhibits they can see.

1. Problem Description

Mrs. Johnson's class is at the museum for 3 hours and wants to spend $\frac{1}{4}$ of an hour at each exhibit. We need to find the number of exhibits they can see.

2. Solution Steps

To find the number of exhibits they can see, we need to divide the total time spent at the museum (3 hours) by the time spent at each exhibit ($\frac{1}{4}$ hour).

So, we need to calculate $3 \div \frac{1}{4}$.

Dividing by a fraction is the same as multiplying by its reciprocal. The reciprocal of $\frac{1}{4}$ is $\frac{4}{1}$ or simply

4. Therefore, $3 \div \frac{1}{4} = 3 \times 4 = 12$.

3. Final Answer

12