2
votes
1answer
5k views

“40-50 years old” vs. “40-50 year olds” when referring to a group

In formal research, which is more correct, and why: the group of 40-50 years old OR the group of 40-50 year olds In any case the phrase in bold is to be treated as a noun only, as in: The ...
2
votes
1answer
5k views

Should I say “3 half days” or “3 half-days” or “3 half-day”?

Should I say "3 half days" or "3 half-days" or "3 half-day"? I mean I want to refer to, for example, the a.m. of Monday, the p.m. of Wednesday, and the a.m. of Friday, together.
3
votes
1answer
499 views

Is “They all had 15 minutes waits” grammatically correct? [duplicate]

Possible Duplicate: Pluralization rule for “five-year-old children”, “20 pound note”, “10 mile run” I was reading an article that used the phrase "15 ...
5
votes
2answers
2k views

Ways to write “2000 year old”

Which of the following are correct and which are wrong? The 2000-year-old computer The 2000 year-old computer The 2000 year old computer The 2000-years-old computer The 2000 years-old computer The ...