How many contact lenses are in one box?

2 pcs/box = 1 pair of contact lenses
3 pcs/box = 1 pair + 1 piece of contact lenses (What?! Click here to learn more.)
4 pcs/box = 2 pair of contact lenses
6 pcs/box = 3 pair of contact lenses
10 pcs/box = 5 pair of contact lenses
12 pcs/box = 6 pair of contact lenses
30 pcs/box = 15 pair of contact lenses
90 pcs/box = 45 pair of contact lenses

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