A column of water `40 cm` high supports a `30 cm` column of an unknown liquid . What is the density of the liquid ?

Explanation

To find the density of the unknown liquid supported by a column of water, we can use the principle that the pressure at the base of both columns is equal. Here’s a step-by-step solution:

### Step 1: Understand the relationship between pressure and height of the liquid columns
The pressure exerted by a column of liquid is given by the formula:
\[ P = \rho \cdot g \cdot h \]
where:
- \( P \) is the pressure,
- \( \rho \) is the density of the liquid,
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