Is it 30 days or 30 day?

Related questions

1. What is the most popular number?
2. Why is 17 unlucky?
3. Do you need an apostrophe for days of the week?
4. Is there an apostrophe in Thursday's?
5. What does it mean if I was born on a Friday?
6. What does the nursery rhyme London Bridge is falling down mean?
7. Are people born on Saturday unlucky?
8. Is it two day or two days?
9. Why is Tuesday called Tuesday?
10. Is Friday Freya's day?

Tags

1. #adjective
2. #project
3. #versus
4. #example
5. #phrase
6. #using