What I am 'moaning' about is that a reference book gives examples of such incorrect usage of words.
Pairing twenty with many is akin to giving a false definition in a dictionary. IMHO.

Yeah, that should never be stipulated in a text or reference book, I wholeheartedly agree. I guess the sanctioning of stuff like this in official text is part of the "dumbing-down" process in our educational systems that we've discussed so much. How these strange and erroneous inclusions, and blatant omissions, make it into print and then escape the perusal of textbook screening/selection committees, I'll never know. It's sadly amazing.