I would like to ask the postage department the questions like "how often the packages got lost in the mail" and "why the packages got lost in the mail".

While it is absolutely correct in Russian to "weld" such a questions together how can I do it in English? Is it correct to ask a question like this:

> 
> **How often and why** does this happen when the packages got lost in the mail?
> 
> 
>