If you're asking how many are left down - the answer would be 4 cards. If how many are face up, the answer would be 8 cards.
Luisa places 8 out of 12 playing cards face up. This is determined by finding the fraction of cards that are face up (2 out of 3) and multiplying this by the total number of cards (12). ;
Luisa places 8 out of her 12 playing cards face up by dividing the cards into groups of 3, with 2 cards in each group being face up. This calculation results in a total of 4 groups, leading to 8 face-up cards. The process involves understanding ratios and simple arithmetic.
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