Please read the below sentences. I don't understand "letters". Does it mean
mail in this context? Also, does "double spaced" mean lines with one empty line after each one?
The typist made no effort to be consistent; she double-spaced the first and third letters, then single spaced the second, fourth, and fifth letters.
Letter: a direct or personal written or printed message addressed to a person or organization
Yes, Double space means one empty line after each complete one?
I hope this helps,