About "much/many more most"

Could you tell me whether I can make sentence something like "How little/few...?"
or"How more/less....? ? 　

Vedi una traduzione

- How much more milk do we need? (for uncountable things)
- How many more eggs do we need? (for countable things)
- What is the most interesting thing you've seen?
- What is the least expensive watch I can buy?

A: It would have to cost less.
B: How much less would it have to cost?
(or simply 'How much less?')

You can use 'how much less' even when the thing in question is about something countable. You could also use 'how much fewer', but some will find that unnatural.

I can't think of any examples where I would use 'how few' or 'how little'. You can just use 'how much/many'. You're just asking about a quantity, no need to imply whether it's large or small.