Informally, people use them both. The countable and non-countable categories are just a broad general rule (to which there are exceptions). Fewer is normally used when it is followed by a plural count-noun.
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AnonymousWhich are correct please?Technically, 'fewer' goes with countable nouns thus:
AnonymousWould you substitute less for fewer in the following yourself?Yes, in every case. But then I don't always speak the way the grammar books tell me to.
AnonymousFor every 30 ml of water, you need to put one dose of formula."Dose"? "dose" is used for medications, i.e., drugs. I think you need a different word, but I don't know anything about baby formula, which I assume you mean, so I don't know the word for that. Something like spoonful or packet would be better.
AnonymousDidn't you say it was 'one less dose' or 2 fewer doses?ThanksI don't know what I said. It's been a long time since I've thought about this. I don't believe I said anything like what you claim, but who knows.