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by shashank.ism » Tue Feb 09, 2010 12:30 pm
Thirty per cent of the employees of a call centre are males. Ten per cent of the female employees have an engineering background. What is the percentage of male employees with engineering background?


A. Twenty five per cent of the employees have engineering background.
B. Number of male employees having an engineering background is 20% more than the number of female employees having an engineering background.

Ans C
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by harsh.champ » Tue Feb 09, 2010 12:42 pm
shashank.ism wrote:Thirty per cent of the employees of a call centre are males. Ten per cent of the female employees have an engineering background. What is the percentage of male employees with engineering background?


A. Twenty five per cent of the employees have engineering background.
B. Number of male employees having an engineering background is 20% more than the number of female employees having an engineering background.

Ans C
CC = call center employees
M=males
F= females
0.3 CC = M hence ,0.7 CC =F
0.1 F = engg. = 0.1 X 0.7 CC


1:- 0.25 CC = engg.,hence we can find out the M from engg. background(0.25 CC - 0.1*0.7*CC = M from engg. backgr.)
2:- M with engg. = 1.2 X F with engg. background = 1.2 X 0.7 X CC

Hence,D.I dont know why C.
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by money9111 » Tue Feb 09, 2010 10:17 pm
well D is incorrect right off the bat because you would need to know the total number of employees in order for knowing that 25% of employees have an engineering background and A does not provide this information
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by harsh.champ » Tue Feb 09, 2010 11:55 pm
money9111 wrote:well D is incorrect right off the bat because you would need to know the total number of employees in order for knowing that 25% of employees have an engineering background and A does not provide this information
Hey money9111,
You can take the total no. of employees as x and still solve the question.
Just try solving it by this method.I guess you will get the answer.:)
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by thephoenix » Wed Feb 10, 2010 12:29 am
money9111 wrote:well D is incorrect right off the bat because you would need to know the total number of employees in order for knowing that 25% of employees have an engineering background and A does not provide this information
as long as its % we can take any value for total employees to solve it

even I wud go for D ; But i am getting a diff value in bth the statements
s1) gives 18%

s2) gives 8.4 %

and as per GMAT in case of D we must get same value using bth the statements

i am not able to find out the trap
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by raisethebar » Wed Feb 10, 2010 12:57 am
cant we answer with A alone.
30% of employee are men so 70% are women.
Now 10% of women employees are with Engg background so

100--10
70 - ?

7% of the total employees are women with Engg back.
now tatal are 25% with engg background so 25-7=18% are men with engg background.

Also i think we ans with B alone.
IMO C.

Please tell what's wrong in above expl.
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by money9111 » Wed Feb 10, 2010 8:18 am
raisethebar you bring up a good point re: 30% meaning 70% then 10%... although like you i'm still not seeing the proper solution :-/
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by sanju09 » Thu Feb 11, 2010 2:08 am
shashank.ism wrote:Thirty per cent of the employees of a call centre are males. Ten per cent of the female employees have an engineering background. What is the percentage of male employees with engineering background?


A. Twenty five per cent of the employees have engineering background.
B. Number of male employees having an engineering background is 20% more than the number of female employees having an engineering background.

Ans C
If x is the total number of employees with the call center out of which m are males, f are females, ebm and ebf are respectively males and females with an engineering background; then

m = 3 x/10, f = 7 x/10, ebf = 7 x/100, and (ebm/x)*100 =?

(1) ebm + ebf = x/4

Or ebm = 9 x/50, now (ebm/x)*100 can be determined to be 18 percent. Sufficient

(2) ebm = 1.2 ebf = 1.2 (7 x/100), now (ebm/x)*100 can be determined to be 8.4 percent. Sufficient

[spoiler]D[/spoiler]

[spoiler]But why the two statements contradict? Is it GMAT query?[/spoiler]
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by money9111 » Fri Feb 12, 2010 6:12 pm
if two statements contradict then there's something wrong with your calculations or the way the question was transcribed. the two statements CANNOT contradict
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by gmatmachoman » Fri Feb 12, 2010 10:29 pm
Hey Guys,
Right early in my morning, I lost my temper after seeing this useless stupid horrible weak irrelevant query.

Whats the big fun in posting these UNKNOWN Sources??

Eric plz do something soon...Its not that I am only facing the prblm..there ars som mnay guys, but they are not screaming becox they are very tolerant but I am not..Sorry!!

@shanshank..I cannot blame you man...I am having a bad day by starting with this one!!

I am still wondering how to solve the only using (2).
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by sanju09 » Fri Feb 12, 2010 11:02 pm
gmatmachoman wrote:Hey Guys,
Right early in my morning, I lost my temper after seeing this useless stupid horrible weak irrelevant query.

Whats the big fun in posting these UNKNOWN Sources??

Eric plz do something soon...Its not that I am only facing the prblm..there ars som mnay guys, but they are not screaming becox they are very tolerant but I am not..Sorry!!

@shanshank..I cannot blame you man...I am having a bad day by starting with this one!!

I am still wondering how to solve the only using (2).
When x is the total number of employees with the call center, there are 7 x/10 number of females, of which 10 percent or 7 x/100 are having an engineering background; and the statement (2) guides us to take the male employees having an engineering background to be 20% more than 7 x/100, which is 21 x/250, so the percentage of male employees with engineering background in a total of x is {(21 x/250)/x} × 100 = 8.4%. Hence, statement (2) alone is sufficient.

[spoiler]But the problem here is not that how (2) alone is sufficient, rather it's how the ambiguous questions making their way to the GMAT libraries. Although, ShriMadBhaagwatGita teaches us both tolerance and perseverance with lots of other great teachings that make us soul, but teachings are easier to know than to practice, really [/spoiler]
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by fibbonnaci » Fri Feb 12, 2010 11:16 pm
money9111 wrote:if two statements contradict then there's something wrong with your calculations or the way the question was transcribed. the two statements CANNOT contradict
I agree with you, though i dont find anything wrong in sanju09 's method. I feel the question is erroneous.

If the OA is C i am sure of one of the 2 things:
1. You made a typo while keying in the option.
2. The source is bad, really bad.

shashank.ism please quote the source of the question when you are posting.

I have handled CAT questions too and I have noticed few of the questions that you have posted are CAT questions. CAT is a different ball game altogether. the questions need a different approach and also they are constructed in a different way.
For eg: in a GMAT question the two statements never contradict each other whereas no such construction exists in CAT.
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