The usage of 'each' and 'every'
There are six apartments in the building. ( ) one has a balcony.
This is an exercise about how to use 'each' and 'every' in a grammar book. It only gives me the answer 'Each', but I think 'Every' is all right too.

(1) Is 'Every' correct too? If so, which is better?

(2) Which is better if the exercise is changed like this?
There are sixty apartments in the building. ( ) one has a balcony.

Question

The usage of 'each' and 'every'
There are six apartments in the building. (   ) one has a balcony.
This is an exercise about how to use 'each' and 'every' in a grammar book. It only gives me the answer 'Each', but I think 'Every' is all right too.

(1) Is 'Every' correct too? If so, which is better?

(2) Which is better if the exercise is changed like this?
There are sixty apartments in the building. (   ) one has a balcony.

Answer

You're right, Haruka, you could say 'every' here. Grammatically it would be correct, but the focus would be slightly different.

If you said 'every one' you would be talking about the building as a whole and the total number of apartments, and the fact that 100% of the apartments have balconies.

If you say 'each one' you are considering the apartments individually.

Don't worry too much about the difference, though, as it is very subtle. And no, it doesn't matter whether there are six or sixty apartments.

Answer

Each is definitely the better answer. If you used every, the sentence would still make sense, but it would be grammatically incorrect. Hope this helps:)