求助GWD数学题，好心人快来呀！谢谢！

苗苗心圃G

GWD5
Q25:我咋觉得B对呢，求解！
If the number 52,1n9, where n represents the tens digit, is a multiple of 3, then the value of n could be which of the following?


A.6
B.5
C.3
D.1
E.0

ＧＷＤ６－Ｑ１１有图。。。但是我弄不上来。。。求题目解析！
A rectangular picture is surrounded by a boarder, as shown in the figure above.Without the boarder the length of the picture is twice its width.If the area of the boarder is 196 square inches, what is the length, in inches, of the picture, excluding the boarder?


A.10
B.15
C.30
D.40
E.60

Q19:
At a certain company, 25 percent of the employees are male and 50 percent of the employees are sales staff.What is the number of employees at this company?
(1)Exactly 7 of the employees at the company are males who are sales staff.
(2)There are 16 more female employees than male employees at the company.


Q19:
At a certain company, 25 percent of the employees are male and 50 percent of the employees are sales staff.What is the number of employees at this company?
(1)Exactly 7 of the employees at the company are males who are sales staff.
(2)There are 16 more female employees than male employees at the company.

答案是Ｂ


Q2:
If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probability that both representatives selected will be women, is p > １／２？
(1)More than １／２of the 10 employees are women.
(2)The probability that both representatives selected will be men is less than １／１０
答案是Ｅ

A rectangular picture is surrounded by a boarder, as shown in the figure above.Without the boarder the length of the picture is twice its width.If the area of the boarder is 196 square inches, what is the length, in inches, of the picture, excluding the boarder?


A.10
B.15
C.30
D.40
E.60

Q19:
At a certain company, 25 percent of the employees are male and 50 percent of the employees are sales staff.What is the number of employees at this company?
(1)Exactly 7 of the employees at the company are males who are sales staff.
(2)There are 16 more female employees than male employees at the company.


Q19:
At a certain company, 25 percent of the employees are male and 50 percent of the employees are sales staff.What is the number of employees at this company?
(1)Exactly 7 of the employees at the company are males who are sales staff.
(2)There are 16 more female employees than male employees at the company.

答案是Ｂ


Q2:
If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probability that both representatives selected will be women, is p > １／２？
(1)More than １／２of the 10 employees are women.
(2)The probability that both representatives selected will be men is less than １／１０
答案是Ｅ

苗苗心圃G

好人呐！谢谢！

wly1202m

....上来找寂静的...我随便扫了一题，先跟你讲下...
Q19:
At a certain company, 25 percent of the employees are male and 50 percent of the employees are sales staff.What is the number of employees at this company?
(1)Exactly 7 of the employees at the company are males who are sales staff.
(2)There are 16 more female employees than male employees at the company.

这类的题目，我推荐你画格子法，就是三行三列，右上方写男/女，左下方写sale/no sale..因为这类题一共就是4个量嘛.很好用的哦~~能让信息一目了然...
条件1：我们知道male and sale的7个，但是没告诉相对应的百分数，不充分；
条件2：女比男多16人. 因为我们知道男的25%，女的就应该是75%，那他们的差是50%，对应的数就是16人啦.
所以16/50%就是总人数，充分.

掌握这个表格法，很好用的^-^  加油吧...

攒RP.....

苗苗心圃G

谁会呐，帮帮忙呐！

苗苗心圃G

呃。。。这个系统总是重复发我的题。。其实一共三道。。。。好多重复。。。