Look at these uses of en:
En as a pronoun can replace a noun when given a quantity of it = I bought twenty of them / I have three of them...
Note the order is as such:
Simple tense : en + [verb] + [number]
Close Future : aller + en + [infinitive] + [number]
Compound tense : en + [auxiliary] + [past participle] + [number]
This also applies to un / une (one):
as well as un autre / une autre (another one):
See also En can replace de + [phrase] (French Adverbial Pronouns)
and Using le/la/l'/les = it/him/her/them (French Direct Object Pronouns)
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Learn more about these related French grammar topics
Examples and resources
Tu achètes un pantalon ? - Oui, j'en achète un.Are you buying (a pair of) trousers? -Yes, I'm buying one.
Tu as aimé ta glace ? - Oui, j'en veux une autre !Did you enjoy your ice cream? - Yes, I want another one!
Vous voulez une boîte de chocolats ? - Oui, je vais en prendre une.Do you want a box of chocolates? - Yes, I'm going to take one.
