When a number is an adjective before a noun we don’t use a plural, but we do use a hyphen.
A five-litres bottle of wine.
A five-litre bottle of wine.- A 25-minute walk.
When the number comes after the noun we don’t use a hyphen. Also, we use a plural, if it is more than one.
- A wine bottle which can hold one litre.
(Only one so no plural.)
A wine bottle which can hold five litres.
(More than one so use a plural.) - My daughter is ten years old.
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