Which is grammatically correct?
1. What problems do your organization solve?
2. What problems does your organization solve?
3. Which problems do your organization solve?
4. Which problems does your organization solve?
Which is grammatically correct?
1. What problems do your organization solve?
2. What problems does your organization solve?
3. Which problems do your organization solve?
4. Which problems does your organization solve?
I respectfully disagree with Andrew. You have to match things up with the object of the sentence. The object in a sentence is the entity that is acted upon by the subject. 'Problems' is the object of this sentence. It is plural so the correct matching is "1. What problems do your organization solve?"