prep数学考题求解

HDcoffee

prep测试软件中有一道数学题， 我一直不明白他想要问什么？请高人指点问题在附件里，是关于a computer chip manufacturer 的defective
chips的

[attachimg]89547[/attachimg]

HDcoffee

这个题要考什么呢？[attachimg]89548[/attachimg]我看后都不知道该怎么选择

sdcar2010

defect ratio =(2+5+4+6)/(5k + 12k + 16k + 18k) = 1/3k

1/3k * 60k = 20

sdcar2010

ABC +150 = 4XX, then A = 2 (when B>=5) or 3 (when B < 5)

ABC + 25 = X7X, then B = 5 or 6, or B>=5


The answer is CCCCCCCCCCCCCCCCCCCc

用头走路

ABC +150 = 4XX, then A = 2 (when B>=5) or 3 (when B < 5)

ABC + 25 = X7X, then B = 5 or 6, or B>=5


The answer is CCCCCCCCCCCCCCCCCCCc

-- by 会员 sdcar2010 (2011/8/18 9:40:38)

这个不对吧~~~
ABC+25=X7X，那B可能的值就是4or5，对吧，真么可能是6呢？
所以B=4or5
然而ABC+150=4XX，所以A=2(当B>=5），or A=3（当B<=5）
所以我觉得选E，没有一个对的

VivienneLynn

ABC +150 = 4XX, then A = 2 (when B>=5) or 3 (when B < 5)

ABC + 25 = X7X, then B = 5 or 6, or B>=5


The answer is CCCCCCCCCCCCCCCCCCCc

-- by 会员 sdcar2010 (2011/8/18 9:40:38)

"ABC + 25 = X7X, then B = 5 or 6, or B>=5"


how can we get 6 from ABC
                                      +25
                                     -------
                                      X7X
B can either be 5 when C<=4 or be 4 when C>=5


the answer should be E.

HDcoffee

defect ratio =(2+5+4+6)/(5k + 12k + 16k + 18k) = 1/3k

1/3k * 60k = 20

-- by 会员 sdcar2010 (2011/8/18 9:37:54)

VivienneLynn

ABC +150 = 4XX, then A = 2 (when B>=5) or 3 (when B < 5)

ABC + 25 = X7X, then B = 5 or 6, or B>=5


The answer is CCCCCCCCCCCCCCCCCCCc

-- by 会员 sdcar2010 (2011/8/18 9:40:38)

这个不对吧~~~
ABC+25=X7X，那B可能的值就是4or5，对吧，真么可能是6呢？
所以B=4or5
然而ABC+150=4XX，所以A=2(当B>=5），or A=3（当B<=5）
所以我觉得选E，没有一个对的

-- by 会员 用头走路 (2011/8/18 10:13:01)

Agree.

HDcoffee

ABC +150 = 4XX, then A = 2 (when B>=5) or 3 (when B < 5)

ABC + 25 = X7X, then B = 5 or 6, or B>=5


The answer is CCCCCCCCCCCCCCCCCCCc

-- by 会员 sdcar2010 (2011/8/18 9:40:38)

"ABC + 25 = X7X, then B = 5 or 6, or B>=5"


how can we get 6 from ABC
                                      +25
                                     -------
                                      X7X
B can either be 5 when C<=4 or be 4 when C>=5


the answer should be E.

-- by 会员 VivienneLynn (2011/8/18 10:17:23)

HDcoffee

[attachimg]89551[/attachimg]