23. 1653-!-item-!-187;#058&000843 翻译题目跟(2)答案 题目跟答案2意思不是一样的吗??? At least 100 students at a certain highschool study Japanese. If 4 percent of the students at the school who studyFrench 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 atthe school who study Japanese also study French. -------------------------------------------------------------------------------------------------------------------------------------------------------- 【答案】B 【思路】
French
~ French
JP
a
b
~ JP
c
d
Total:
设study French & study JP 人数为a 设没有study French & study JP 人数为b 设study French & 没有study JP 人数为c 设没有study French & 没有study JP 人数为d 题目已知,,求a+c > a+b ? (1) a=16, 不充分 (2) ,已知,可算出,可得a+c>a+b,充分
35.3076-!-item-!-187;#058&003114 If p and n are positive integers and p> n, what is the remainder when p2 - n2 is divided by15 ? (1) The remainder when p + n is divided by 5 is 1. (2) The remainder when p - n isdivided by 3 is 1. -------------------------------------------------------------------------------------------------------------------------------------------------------- 【答案】E 【思路】=(p+n)(p-n) (1) p+n=5a+1----------------------------------------------------------------------insufficient (2) p-n=3b+1-----------------------------------------------------------------------insufficient (1)(2)(p+n)(p-n)=(5a+1)(3b+1)=15ab+5a+3b+1---------------------------insufficient 55. 4687-!-item-!-187;#058&004202翻译 Malik's recipe for 4 servings of acertain dish requires 1 cups of pasta. According to this recipe, what is the number of cups of pasta that Malikwill use the next time he prepares this dish? (1) The next time he prepares this dish, Malik will make half as manyservings as he did the last time he prepared the dish. (2) Malik used 6 cups of pasta the last time he prepared this dish.
不会~64.5320-!-item-!-187;#058&004563 Are at least 10 percent of the peoplein Country X who are 65 years old or older employed? (1) In Country X, 11.3 percent of thepopulation is 65 years old or older. (2) In Country X, of the population 65years old or older, 20 percent of the men and 10 percent of the women areemployed. -------------------------------------------------------------------------------------------------------------------------------------------------------- 【答案】B 【思路】假设65岁(含)以上男生数为x,女生数为y (1) 由此可得知 x+y=11.3，但未知employed信息。←选项(1) 不成立 (2) 由此可得知题目所确认(65 years old or older & employed)的信息为: 确认是否>0.1 = = 0.2-0.1>0.1? => 2>1+由此式可得知 2一定大于1+因一定小于1(在x,y皆为正整数的情形下) 所以由此式可推得符合条件1.65years old or older & 2. Employed 的比率一定大于10%←选项(2) 成立我选 C 93. 10285-!-item-!-187;#058&007154
In the figureabove, a square is inscribed in a circle. If the area of the square region is 16, what is the area of the circularregion? 这一题图在附件里
64. 5320-!-item-!-187;#058&004563 Are at least 10 percent of the peoplein Country X who are 65 years old or older employed?
(1) In Country X, 11.3 percent of thepopulation is 65 years old or older.
(2) In Country X, of the population 65years old or older, 20 percent of the men and 10 percent of the women areemployed. -------------------------------------------------------------------------------------------------------------------------------------------------------- 【答案】B
你想复杂了 (2)条件充分 20 percent of the men and 10 percent of the women areemployed 那么 peoplein Country X who are employed at 65 years old or older 肯定>10% 20%X+10%Y>10%(x+Y)
55. 4687-!-item-!-187;#058&004202 翻译 Malik's recipe for 4 servings of acertain dish requires 1 cups of pasta. According to this recipe, what is the number of cups of pasta that Malikwill use the next time he prepares this dish?
(1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.
(2) Malik used 6 cups of pasta the last time he prepared this dish.
不会 前提给的4 servings of acertain dish 需要 1 cups of pasta 我看不到这里的 1 是什么？假设是选吧 其实你别管什么dish past 什么意思 你只要 知道 1dish （包含4个服务） 需要x个cups of pasta 条件1 就是说 The next time 1dish （包含2个服务）,那么就需要X/2个 cups of pasta 条件2 就是说X=6 所以是C 你那里的 1 是什么？
赫赫 如果是3/2的话 那么我上面的解释就错了 提示是"4 servings of a certain dish 需要 3/2 cups of pasta " 注意这里的" a certain dish" 正好与条件2给的"(2) Malik used 6 cups of pasta the last time he prepared this dish"对应
条件2 表明 the last time he prepared 6/(3/2)个dish 即4个dish 即this recipe contains 4个dish 对应 According to this recipe
虽然答案还是C 但是思路和我上面说的完全不一样了 要知道the next number 必须知道 this recipe 的dish 数目 和每个dish 需要 cups of pasta 数目(新的dish下 是原来的一半)
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发表于 2010-9-21 21:40:33
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