Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: The first $20$ numbers of an arrangement are shown below. What would be the value of the $40^{\mathrm{th}}$ number if the arrangement were continued?

$\bullet$ Row 1: $2,$ $2$

$\bullet$ Row 2: $4,$ $4,$ $4,$ $4$

$\bullet$ Row 3: $6,$ $6,$ $6,$ $6,$ $6,$ $6$

$\bullet$ Row 4: $8,$ $8,$ $8,$ $8,$ $8,$ $8,$ $8,$ $8$
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