[jhbadger]

Obviously Americans know it from the Gettysburg Address where Lincoln referred to the US being founded "four score and seven years ago", but he was being intentionally poetic, but you may not count 19th century as "modern" (even though from the linguistic perspective it is), but people often say things like "there are scores of movies where the protagonist finds out he is a prophesized hero" even today.

[umanwizard]

That usage (“there are scores of x”) is figurative and doesn’t literally mean “20 * n”.