OK - let me enter my pet grammar peeve - the proper application of "Less" vs. "Fewer".
"Less" is used when referring to a non countable item - e.g.
"The restoration was less than adequate""Fewer" is used when referring to a countable item - e.g.
"There are fewer than ten of these left in the world".So statements in ads such as
"There were less then fifty built" are cringeworthy. But I routinely see this error, including in newspaper and other periodical articles. And please don't ask
"What's a newspaper or a periodical?".
And I must give credit to the elementary school nuns who drilled this into me between whackings with a pointer or ruler. For an historical reference on this, view the scene from the
Blues Brothers film where Jake and Elwood visit the Penguin:
https://www.youtube.com/watch?v=uDcP9uSMra4