Hi, In each of these pairs, the first sounds normal and the second sounds odd. The idea is that it is the whole quantity that is, eg, fantastic. In other words, for example, if you jump 25eet, the first foot does not seem impressive, nor does the second.
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CalifJimOnly 1 and 3 strike me as idiomatic. 5 is borderline.What do you think makes 5 borderline, CJ?
CJ