263. DS: O could be addition, subtraction, or multiplication. what is O? (1) 6 O 2 = 2 O 6 (2) 7 O (3 5) not equal to 7 O 3 7 O 5 Choose (C)
264. DS: a,b,c,d are integers, a Are a,b,c,d consecutive intergers? (1) c-b=1 (2) d-a=3 Choose (B)
265. DS: The ratio of the income of Karl to that of Mia is 10:9 in 1994, Did Mia earn more in 1995 than in 1994? (1) Karl earned more in 1994 than in 1995? (2)the ratio of the income of Karl to that of Mia is 9:10 in 1995 Choose (E)
266. PS: X,Y are digits, if 0.XY 0.YX=0.XX, what s Y? Choose Y=0
267. PS: a sequence a_i = a_{i-1} d 等差数列 If the first term is 54, 17th term is 30, what is 25th term? Choose 18