21 glass spheres, each of radius 2cm are packed in a cuboidal box of internal dimensions `16 c mx8c mx8c m` and, then the box is filled with water. Find the volume of water filled in the box.

Explanation

To solve the problem of finding the volume of water filled in the cuboidal box after packing 21 glass spheres, we will follow these steps:

### Step 1: Calculate the volume of the cuboidal box
The formula for the volume \( V \) of a cuboid is given by:
\[ V = \text{length} \times \text{breadth} \times \text{height} \]
Given the dimensions of the box are \( 16 \, \text{cm} \times 8 \, \text{cm} \times 8 \, \text{cm} \):
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