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).
The question involves the understanding of fractions and proportions which is a part of Mathematics. Luisa has a total of 12 playing cards. If she places 2 out of every 3 cards face up, it is important to calculate the number of face-up cards. Every 3 cards, 2 are face up. Since 12 cards is equal to 4 groups of 3, multiply that number by 2 (the number of face-up cards in each group). Therefore, Luisa places 8 cards face up.
#SPJ3
(9, 2), (3, 4)
(2, 9), (3, 4)
(2, 9), (4, 3)