Ambiguous Usage

Question 1

Singular/plural of pair

Answer 1

If you’re talking about two separate things(a pair of pumpkins, for example), treat pair as plural: A pair of pumpkins are in the window.

“If you’re talking about one thing that just happens to have two parts (like a pair of shoes), treat pair as singular: One pair of shoes is black. But add another pair and you have multiple pair or pairs; either plural is fine: Two pair [or pairs] are brown.”
But our advice is to take the path of least resistance and use “pairs” in a situation like yours: “Each package contains six pairs of socks.”