A pen stand made of wood is in the shape of a cuboid with four conical depressions to hold pens. The dimensions of the cuboid are 15 cm by 10 cm by 3.5 cm. The radius of each of the depressions is 0.5 cm and the depth is 1.4 cm. Find the volume of wood in the entire stand.

Explanation

To find the volume of wood in the pen stand, we need to calculate the volume of the cuboid and subtract the volume of the four conical depressions from it. Here’s how to do it step by step:

### Step 1: Calculate the Volume of the Cuboid
The formula for the volume \( V \) of a cuboid is given by:
\[ V = \text{length} \times \text{breadth} \times \text{height} \]
Given dimensions:
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