How to calculate Weighted-average common shares outstanding-Diluted

I see the following Form 3.

When I calculate Weighted-average common shares outstanding-Diluted, do I have to include all the number of Class A Common Stock and all the number of Class B Common Stock?

Do I have to treat Class A stock and Class B stock differently, like using different weighting?

Also, why does the number of Class A Common Stock is always the same of the number of Class B Common Stock? Or, this happens just by accident?