Short Answer 
The manager calculates the container’s volume using the formula lwh, then determines the total volume of 63 bento boxes (3 layers of 21) to ensure they fit. Finally, the employee confirms that both volume calculations match, verifying the efficiency of the container’s dimensions for storage.
Step 1: Calculate the Container’s Volume
The manager can determine the volume of the container by applying the formula lwh, where l represents the length, w is the width, and h is the height. By inserting the corresponding dimensions into this formula, the manager will receive the total cubic measurement that the container can hold.
Step 2: Determine Bento Box Volume
Next, the employee establishes that the container can be filled with 3 layers of 21 bento boxes each. To find the total volume of bento boxes within the container, multiply the number of bento boxes by the volume of a single bento box. This gives an accurate representation of the total box capacity based on the established layers.
Step 3: Compare and Confirm Volumes
Finally, the employee checks that the volume calculated using the lwh formula matches the total volume derived from the bento box calculation. If both volumes are equal, it confirms that the container’s dimensions adequately support the storage of the bento boxes, ensuring efficient use of space.