[转帖]滴水之恩，涌泉相报---> 核对答案

滴水之恩，涌泉相报---> 核对答案
1。PS: 一个圆环的面积和里面小环的面积之比为4，求大圆和小圆的周长比。（有图）

2.DS: x.y.z are integers, whether xy is even?

(1) xz is even

(2) yz is even

3.PS: a function
f(x) (x is positive integer) is defined as the number of intergers
which are less than x and do not have common factor with x other than
1, if p is any prime number, f(p)=?

(1) p-2

(2) p-1

(3) (p+1)/2

(4) (p-1)/2

(5) 2

4.DS: 一个三角形PQR(有图），角PQR为x,问PR>QR吗？

（1）PQ=PR

(2) x不等于60度

5.PS: 8！=2的J次方乘以3的K次方乘以5的L次方乘以7的M次方，问J+K+M+L=?(类似出现过的jj 题）

6.PS:
In a company 50% of male employees and 40% of female employees are more
than 35 years old, 42% of total employees are more than 35 years,ask
female employees is what percent of total employees.

7.DS: in a x-y plane, line l and line k intersect at a point (-4/5, 8/5) ( 数字不准，但不影响），ask the slope of line l.

(1) line l is perpendicular to line k

(2) link k 过原点

8.DS: line k 过原点,whether point (-2/3,3/4) is on the line k?

(1) (-2,3)在line k 上

(2) (2,-3)在line k 上

( 数字不准，但不影响）

9.PS: a manager 召集m个directors 开会,每个director 又召集了n个 salespersons 开会(一起),问总共有多少人包括directors and salespersons 开会?

10.PS: an item is sold at a listed prix $210.00, including 5% tax, what is the price of the item before tax?

(1)$199.50

(2)$200.00

(3).(4).(5) 都大于$200.00

这题我有点迷惑,题目中只说了tax 是5%,但没有说是tax前的价格还是tax 后的价格的5%,按照常理似乎应该是tax 前的,我就选了$200.00,由于也不知道是否做对了

11. DS: what is the value of x的平方?

(1)5 (2)x is an integer

12. PS: what percent of 10 equal to 10 percent of 1?

(1)0.01%

(2)0.1%

(3)1%

(4)10%

(5)100%

percent太多,容易把人绕晕

13.
PS: a machine makes 100 units in 5 hours, if add a distinct machine,
two machines together make 100 units in 2 hours, how many units does
this added machine make in an hour?

(1) 10

(2) 20

(3) 30

(4) 40

(5) 50

14. ds: S and M respectively drived t hours, S covered 350 miles and M covered 325 miles, what is M's speed?

(1)t=5

(2)S's speed is 5 mile/hour greater than M's

15. ds. Tom paid income tax at a rate of 6% of annual income in 1999,Tome paid what percent of income in 2000 ?

(1)the taxable income of Tom is $34,200(数字不准) in 1999

(2)in 2000 Tome paid $600.00 more than what he paid in 1999

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谢谢险！

1 根号5

2 E

3 2

4 E

5 11

6 80%

7 C

8 E

9 MN+1

10 2

11 ?

12 2

13 3

14 D

15 E