teacher wants to hang fary lights along the sides of 3 walls of the classroom. She does not want to cover the wall the white board. The length of the class is 6 m and the width 4 m . many metres of fairy lights does she need?

To determine how many meters of fairy lights the teacher needs, we need to calculate the total length of the three walls that will be covered with lights. 1. **Identify the dimensions of the classroom:** - Length of the classroom (L) = 6 m - Width of the classroom (W) = 4 m 2. **Determine which walls will be covered:** - The teacher wants to cover three walls, which means she will cover: - One length wall (6 m) - The other length wall (6 m) - One width wall (4 m) - The wall with the whiteboard (the other width wall) will not be covered. 3. **Calculate the total length of the walls to be covered:** \[ \text{Total length} = L + L + W = 6 + 6 + 4 \] Now, let's perform the calculation. \[ \text{Total length} = 6 + 6 + 4 = 16 \text{ m} \] Thus, the teacher needs **16 meters** of fairy lights.