TT-10的几题，脑子卡住了

rock19840717

Q10:

A certain quantity is measured on two different scales, the R-scale and the S-scale, that are related linearly.  Measurements on the R-scale of 6 and 24 correspond to measurements on the S-scale of 30 and 60, respectively.  What measurement on the R-scale corresponds to a measurement of 100 on the S-scale?

 A 20

 B 36

 C 48

 D 60

 E 84

这题是啥意思啊。。。

Q28:

In 1994, Kenneth’s annual salary was 30 percent higher than it was in 1993.  In 1995, Kenneth’s annual salary was reduced to 104 percent of his 1993 annual salary.  Kenneth’s 1995 annual salary was what percent less than his 1994 annual salary?

 

A.        16%

B.        20%

C.        24%

D.        26%

E.        28%

 

Q32:

If n is a positive integer, what is the value of the hundreds digit of 30ⁿ?

(1)     30ⁿ > 1,000

(2)     n is a multiple of 3.

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

我觉得是E啊，两个其实都是n>＝3

谢谢大家啦

rock19840717

自己顶一下

connie4895

以下是引用rock19840717在2008-9-9 9:09:00的发言：

Q10:

A certain quantity is measured on two different scales, the R-scale and the S-scale, that are related linearly.  Measurements on the R-scale of 6 and 24 correspond to measurements on the S-scale of 30 and 60, respectively.  What measurement on the R-scale corresponds to a measurement of 100 on the S-scale?

 A 20

 A 20

 B 36

 B 36

 C 48

 C 48

 D 60

 D 60

 E 84

 E 84

这题是啥意思啊。。。

考比例尺的关系

可以设联立方程式如下:

30=A+6B

60=A+24B

解联立得A=20, B=5/3

代入 >> 100=20+5/3R

R=48

这题是啥意思啊。。。

考比例尺的关系

可以设联立方程式如下:

30=A+6B

60=A+24B

解联立得A=20, B=5/3

代入 >> 100=20+5/3R

R=48

Q28:

In 1994, Kenneth’s annual salary was 30 percent higher than it was in 1993.  In 1995, Kenneth’s annual salary was reduced to 104 percent of his 1993 annual salary.  Kenneth’s 1995 annual salary was what percent less than his 1994 annual salary?

 

 

A.        16%

B.        20%

C.        24%

D.        26%

E.        28%

设1993年为X, 1994年则为1.3X, 1995年则为1.04X

[(1.3X-1.04X)/1.3X]*100=20% 

Q32:

If n is a positive integer, what is the value of the hundreds digit of 30ⁿ?

(1)     30ⁿ > 1,000

(2)     n is a multiple of 3.

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案是(D), 问的是百位的数值是多少

(1) 即然都大于1,000了, 那至少是3次方以上, 3次方以上百位数值都是0了

(2) n是3的倍数, 那最少就是3了, 跟(1)一样，百位数值都是0了

我觉得是E啊，两个其实都是n>＝3

谢谢大家啦

sheibiwosha

建议你发贴的时候每贴一题

先说第一题吧

两种测量单位，相互关系是线性的，打个比方，你可以用秒来测时间，也可以用小时来测，但是线性关系的。

单位R的6和24对应于单位S的30和60，问你单位R的多少对应于单位S的100

假设S=f(R)=aR+b

30=6a+b

60=24a+b

a=3/5,b=20

所以S=5R/3 + 20

S=100的时候，R=48

rock19840717

恩，谢谢大家，不好意思多帖了一道，最后题n=3我给算成2700。。。，谢谢啊！！！