This is quite a common mistake along with the similar;
× A ten dollars bill.
Everyone knows that in English we have;
○ One dog, two dogs, three dogs.
○ One year, two years, three years.
But here dogs and years are nouns. (and are countable.)
In the sentence above;
A ______ Bill - is the noun
Ten-dollar - is the adjective.
Remember adjectives describe nouns. And they are not countable.
It is like big or small, or fast or rich.
○ One big cat.
× Two bigs cat.
○ Two big cats.
So as ten-dollar, and two-year old are adjectives we don't use an S with them. We use them just like regular adjectives.
Notice we have A_____Noun.
○ I have a two-year old child.
○ Give me a ten-dollar bill.
○ I need a five-pound note.
○ I went on a three-week vacation.
○ It is a ten-minute walk from the station.
○ I live a 10-minute drive from the beach.
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