What does "At least X to Y" mean?

Question

What does it mean to say "at least..." and then give a range of values? "At least 10" means anything greater than or equal to ten. "10 to 15" means anything greater than or equal to 10, but not greater than 15. I hear it in everyday speak all the time. A teacher might assign a report that "must be at least 10-15 pages." What does that mean? Does she mean that the paper must be 10-15 pages, or does she mean that a lower bound on the pages we need to write, has not been decided, but will be in the range of 10 to 15? Or does she just mean *at least 10*? - What does “at least ten to fifteen pages” mean?

Answer 1

It means that the minimum is 10 pages. I think because there are different font size and spacing, you could end up with different number of pages.