Your answer is incomplete, assuming the usual Wason selection problem where the phrasing is "if a card has a number divisible by 4 [which could be face down]…"

Your answer is incomplete, assuming the usual Wason selection problem where the phrasing is "if a card has a number divisible by 4 [which could be face down]…" rather than "if a card is showing [face up] a number divisible by 4". If I were trying to hide a bad card (i.e. a card that didn't satisfy the requirements) in there, and you were following that stratey, I could successfully hide a bad card from you.