Number和Percentage，请教下思路，顺便问一道Bible题SEP 1995 SEC1, #20

ivy3997

这种类型的题是我现在反复练还反复错的，感觉可能是数学没学好，终于遭报应了。

有些即使检查答案时想想能想通，卡时间做题时思路还是没那么快，一读数字就脑子一片浆糊。

晕死了，有没有什么简易的思路啊。

另外，Bible有一题，解释我都没看懂。444页的第4题。上面说是SEP 1995 SEC1, #20题

我能prephrase出应该是总体人数上涨，non-M的学生增多。但怎么也理解不了E啊

请教各位！！衷心感谢！！

ivy3997

是不是没贴出题目的关系，那题目附上：
Central Markland College
Students from outside the province of Markland, who
in any given academic year pay twice as much
tuition each as do students from Markland, had
traditionally accounted for at least two-thirds of the
enrollment at Central Markland College. Over the
past 10 years academic standards at the college have
risen, and the proportion of students who are not
Marklanders has dropped to around 40 percent.
Which one of the following can be properly inferred
from the statements above?
(A) If it had not been for the high tuition paid by
students from outside Markland, the college
could not have improved its academic
standards over the past 10 years.
(B) If academic standards had not risen over the
past 10 years, students who are not
Marklanders would still account for at least
two-thirds of the college’s enrollment.
(C) Over the past 10 years, the number of students
from Markland increased and the number of
students from outside Markland decreased.
(D) Over the past 10 years, academic standards at
Central Markland College have risen by
more than academic standards at any other
college in Markland.
(E) If the college’s per capita revenue from tuition
has remained the same, tuition fees have
increased over the past 10 years.

ivy3997

列了两组数字，一组是入学总人数不变，一组是总人数增加稀释了non-M的例子，已经可以理解这个选项的意思了

但考试这样子拿笔算明显时间来不及吧。怎样能够让自己思路变快呢？

sdcar2010

The way I looked at answer E is the following:

If the college’s per capita revenue from tuition has remained the same, that means the school EARNS the same amount of money on average from each student, whether the non-M student is 66% or 40% of the total student population. How could the school do that when the percentage of high-paying, non-M student is decreasing?  The only way is to raise the standard tuition fee for everyone.  An analogy is the US tax system. To fill the gap of tax deficit caused by shrinking rich taxpayers, Uncle Sam can raise the standard tax for everyone!

taoransk

学费为本地生两倍的外地学生在过往通常占据在校生的2/3,在过去10年里学校学术水平一直在提升,而外地学生数量则掉到了40%

(A) 如果不是外地学生支付的高昂学费,过去10年里学校不可能提升学术水平
(B) 如果学术水平没有提升,外地学生数量应该至少保持2/3的在校生总量
(C) 过去10年里本地生数量提升而外地生数量下降
(D) 过去10年里本校学术水平比当地其他学校提升大
(E) 如果学校由学费所得的人均收入保持不变,学费在过去10年里增加了

显然, 答案是E, 以前1/3*1+2/3*2  = 1.67, 现在是 0.6 * 1 + 0.4 * 2 = 1.4 总收入下降了, 如果人均数量不变, 要么总人数下降, 要么单位收入上升. 也就是学费增加

taoransk

And just as sdcar said, Obama had just raised overall income tax for everyone again ..... dam good deal for wall street once again. well, at least the Dem.s had successfully delaied the doomsday, caused by general social medic and life assurance dilapidation, from 2020s to longer, bravo!

taoransk

关于考试....这题目其实很简单的, 眼睛亮点的看题目就分析出来两个数据的关系, 而如果读答案的时候也能看到前面的都是胡扯和out of scop, 只有最后一个和这两个数字有点关系

如果在答案里晕掉...那么可能是把学费问题和学术水平的分别看漏了

还好没有给弄出入学水准和学术水平(都是standard)的区别

ivy3997

多谢各位耐心的解答和思路的分享。我感觉有点头绪了。

现在LR里argument越来越长，就是需要读时快速找重点。我就总是绕在细节里，总是反复想，他给这个条件什么意思呢？会不会有关联。

嗯，不能这样做。