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9.617-!-item-!-187;#058&000483
If x is a positive integer, is x < 16 ?
(1) x is less than the average (arithmetic mean) of the first ten positive integers.
(2) x is the square of an integer.
WHy answer A?
23.1653-!-item-!-187;#058&000843
At least 100 students at a certain high school study Japanese. If 4 percent of the students at the school who study French also study Japanese, do more students at the school study French than Japanese?
(1)16 students at the school study both French and Japanese.
(2)10 percent of the students at the school who study Japanese also study French.
我觉得是E，可答案是B？
40.3636-!-item-!-187;#058&003488
Beth's bank charges a service fee on a regular checking account for each month in which the balance on the account falls below $100 at any time during the month.Did the bank charge a service fee on Beth's regular checking account last month?
(1)During last month, a total of $1,000 was withdrawn from Beth's regular checking account.
(2)At the beginning of last month, Beth's regular checking account balance was $500.
上月初是￥500, 抽出￥1000， 那至少有一个时刻是小于￥100，因此觉得选C。
41.3690-!-item-!-187;#058&003497
Machines X and Y work at their respective constant rates.How many more hours does it take machine Y, working alone, to fill a production order of a certain size than it takes machine X, working alone?
(1) Machines X and Y, working together, fill a production order of this size in two-thirds the time that machine X, working alone, does.
(2) Machine Y, working alone, fills a production order of this size in twice the time that machine X, working alone, does.
问题是1/y - 1/x =?
1) 1 / (1/x + 1/y)=2/3x
2) 1/y = 2/x
两者一起可以算出X等于多少，那就能知道结果。因此选C。请指教以上公式有哪里错？
23.1653-!-item-!-187;#058&000843
At least 100 students at a certain high school study Japanese. If 4 percent of the students at the school who study French also study Japanese, do more students at the school study French than Japanese?
(1)16 students at the school study both French and Japanese.
(2)10 percent of the students at the school who study Japanese also study French.
我觉得是E，可答案是B？
40.3636-!-item-!-187;#058&003488
Beth's bank charges a service fee on a regular checking account for each month in which the balance on the account falls below $100 at any time during the month.Did the bank charge a service fee on Beth's regular checking account last month?
(1)During last month, a total of $1,000 was withdrawn from Beth's regular checking account.
(2)At the beginning of last month, Beth's regular checking account balance was $500.
上月初是￥500, 抽出￥1000， 那至少有一个时刻是小于￥100，因此觉得选C。
41.3690-!-item-!-187;#058&003497
Machines X and Y work at their respective constant rates.How many more hours does it take machine Y, working alone, to fill a production order of a certain size than it takes machine X, working alone?
(1) Machines X and Y, working together, fill a production order of this size in two-thirds the time that machine X, working alone, does.
(2) Machine Y, working alone, fills a production order of this size in twice the time that machine X, working alone, does.
问题是1/y - 1/x =?
1) 1 / (1/x + 1/y)=2/3x
2) 1/y = 2/x
两者一起可以算出X等于多少，那就能知道结果。因此选C。请指教以上公式有哪里错？
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发表于 2012-4-27 17:54:18
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