[tlhIngan Hol] Can the {'ar} be used on its own ?

Can the {'ar} be used on its own, or is it absolutely necessary to always follow a noun ? And because it is almost certain, that someone will say "if it doesn't follow a noun, then how will the reader know how many of what/who you inquire about ?". Then I will reply saying, that it is possible for the context of the text to specify what it is what we are inquiring about, without repeating it again. If for instance, the text speaks of a number of officers defying orders, then can we say: {HeQQo' 'ar ?} How many refused to comply ? qunnoq