We can simplify the ratio as $\frac{10^{2000}(1+10^2)}{10^{2001}(1+1)} = \frac{101}{20}$.
To find the closest whole number approximation, we divide 101 by 20 and round to the nearest whole number.
Since $\frac{101}{20} \approx 5.05$, the closest whole number is $\boxed{5}$.
The answer is: 5
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Which whole number is the closest approximation to the ratio $\frac{10^{2000}+10^{2002}}{10^{2001}+10^{2001}}$?

### Answer:
