Complete for 2 points

Structair: cia mheud?

Structure: how many?

The word tha appears in the question so we know to answer using the tha / chan eil structures in the answer.

Cia mheud … a tha … aig… ?

How many … do(es) … have?

The noun after cia mheud always takes the singular. 

We can use the prepositional pronouns for aig to create questions about others. 

agam have / at me 
agad have / at you 
aige have / at him / it 
aice have / at her / it 
againn have / at us 
agaibh have / at you  
aca have / at them