4 men, each working 6 hours per day can build a wall in 9 days. How long will 6 men, each working 3 hours per day take to finish the same work?

Explanation

To solve the problem, we will use the concept of work done, which can be expressed as:

\[ \text{Work} = \text{Number of Men} \times \text{Number of Days} \times \text{Number of Hours per Day} \]

### Step 1: Calculate the total work done by the first group of men.

Given:
- Number of men = 4
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