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Of 30 applicants for a job, 14 had at least 4 years'

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Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 20 Dec 2012, 08:26
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E

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Of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3 had less than 4 years' experience and did not have a degree. How many of the applicants had at least 4 years' experience and a degree?

(A) 14
(B) 13
(C) 9
(D) 7
(E) 5
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Re: Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 20 Dec 2012, 08:28
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Walkabout wrote:
Of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3 had less than 4 years' experience and did not have a degree. How many of the applicants had at least 4 years' experience and a degree?

(A) 14
(B) 13
(C) 9
(D) 7
(E) 5


Probably the easiest way to solve would be to make a matrix:
Attachment:
Experience.PNG
Experience.PNG [ 3.63 KiB | Viewed 13874 times ]
Note: numbers in black are given and numbers in red are calculated.

Answer: E.
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Of 30 applicants for a job, 14 had at least 4 years' experience, [#permalink]

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New post 14 May 2013, 16:27
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Step 1: assign variables to each of the data points provided in the question so that they correspond to the OVERLAPPING SETS formula:

30 = Total Applicants = T
14 = Applicants with 4 yrs exp = G1
18 = Applicants with degrees = G2
3 = Applicants with NEITHER 4yrs exp nor degrees = NONE
?? = Applicants with BOTH 4yrs exp AND degrees = BOTH

Step 2: recall the formula for overlapping sets with 2 groups: Total = G1 + G2 - BOTH + NONE

Step 3: Plug and chug the variables that we just assigned to solve for BOTH:
T = G1 + G2 - BOTH + NONE
30 = 14 + 18 - BOTH + 3
30 = 35 - BOTH
-5 = -BOTH
5 = BOTH

Correct Answer = E
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Re: Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 14 May 2013, 17:40
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albertrahul wrote:
Of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3 had less than 4 years' experience and did not have a degree. How many of the applicants had at least 4 years' experience and a degree.

(A) 14
(B) 13
(C) 9
(D) 7
(E) 5

Let's discuss.


Image

The set of 30 applicants is a square.

Applicants who have less than four years experience and also have no degree are outside both the circles. = 3 applicants.

Left circle denotes the number of applicants with at least 4years experience = A.

Right circle denotes the number of applicants with degrees = B.

Now number of applicants in both the circles should be 30 - 3. ie 27.

This 27 is equal to A + B - A intersection B.

We have to find A intersection B.

27 = 14 + 18 - A intersection B which gives A intersection B as 5
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Re: Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 19 Nov 2015, 11:12
Walkabout wrote:
Of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3 had less than 4 years' experience and did not have a degree. How many of the applicants had at least 4 years' experience and a degree?

(A) 14
(B) 13
(C) 9
(D) 7
(E) 5


Working same as Bunuel, still sahring
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Degree and Experience.PNG
Degree and Experience.PNG [ 3.69 KiB | Viewed 7184 times ]


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Re: Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 19 Nov 2015, 17:19
Hi BlueDragon2010,

Each of the responses presents a variation on the solution. Here's one that uses the Tic-Tac-Toe board.

The initial 3x3 grid contains the information given by the prompt.

The second 3x3 grid contains the first set of deductions (the sub-totals, in blue), followed by the sub-groups (in green).

http://postimg.org/image/h4gg5bmu5/

The answer to the question is in the upper-left corner:

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Re: Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 07 Jul 2016, 09:24
1
1
Walkabout wrote:
Of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3 had less than 4 years' experience and did not have a degree. How many of the applicants had at least 4 years' experience and a degree?

(A) 14
(B) 13
(C) 9
(D) 7
(E) 5


For this we can setup a table with 2 main categories: years of experience and degrees. These can be broken down further into:

1) Had at least 4 years of experience

2) Had less than 4 years of experience

3) Had a degree

4) Did not have a degree

In addition we are given the following information:

1) There are 30 total applicants

2) 14 applicants had at least 4 years of experience

3) 18 applicants had degrees

4) 3 applicants had less than 4 years of experience and did not have a degree

Let’s fill all this information into a table.

Image


We can use the information to fill in the rest of the chart. Remember the “Total” label in each column or row represents the sum of the preceding two cells in each column or row, respectively.

Image

We are asked how many of the applicants had at least 4 years' experience and a degree. We can see from our table that the answer is 5.

Answer is E.
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Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 07 Mar 2018, 12:15
Walkabout wrote:
Of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3 had less than 4 years' experience and did not have a degree. How many of the applicants had at least 4 years' experience and a degree?

(A) 14
(B) 13
(C) 9
(D) 7
(E) 5



can anyone tell me whats wrong with my solution? or is it correct? :-) ? :?

\(14+18+3-2x=30\)

\(35-2x=30\)

\(5 = 2x\)

chetan2u hello, :) can please tell me if my solution is correct? it seems like i got 5, but if solve the last part to the end, then i will have x = 2.5 :-)

niks18 hello :) perhaps you have idea? :-)
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Re: Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 10 Mar 2018, 11:35
1
dave13 wrote:
Walkabout wrote:
Of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3 had less than 4 years' experience and did not have a degree. How many of the applicants had at least 4 years' experience and a degree?

(A) 14
(B) 13
(C) 9
(D) 7
(E) 5



can anyone tell me whats wrong with my solution? or is it correct? :-) ? :?

\(14+18+3-2x=30\)

\(35-2x=30\)

\(5 = 2x\)

chetan2u hello, :) can please tell me if my solution is correct? it seems like i got 5, but if solve the last part to the end, then i will have x = 2.5 :-)

niks18 hello :) perhaps you have idea? :-)


Hi dave13

what is your logic behind "2x"? what is "x" and why "2x" ?
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Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 11 Mar 2018, 03:20
niks18 wrote:
dave13 wrote:
Walkabout wrote:
Of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3 had less than 4 years' experience and did not have a degree. How many of the applicants had at least 4 years' experience and a degree?

(A) 14
(B) 13
(C) 9
(D) 7
(E) 5



can anyone tell me whats wrong with my solution? or is it correct? :-) ? :?

\(14+18+3-2x=30\)

\(35-2x=30\)

\(5 = 2x\)

chetan2u hello, :) can please tell me if my solution is correct? it seems like i got 5, but if solve the last part to the end, then i will have x = 2.5 :-)

niks18 hello :) perhaps you have idea? :-)


Hi dave13

what is your logic behind "2x"? what is "x" and why "2x" ?



Hi niks18, thanks for a nice question :) i am more than happy to explain :)

let me explain my logic :)

total applicants 30

14 at least have 4 years` experience

18 - have degrees

3 - had less than 4 years experience and dont have experinence

now question: How many of the applicants had at least 4 years' experience and a degree ?

hence let number of applicants who had both at least 4 yrs experience and a degree be 2x (why 2 and not just x because it says both hence x+x = 2x )

please advice :)

have a fantastic day :)
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Re: Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 11 Mar 2018, 03:38
1
dave13 wrote:

Hi niks18, thanks for a nice question :) i am more than happy to explain :)

let me explain my logic :)

total applicants 30

14 at least have 4 years` experience

18 - have degrees

3 - had less than 4 years experience and dont have experinence

now question: How many of the applicants had at least 4 years' experience and a degree ?

hence let number of applicants who had both at least 4 yrs experience and a degree be 2x (why 2 and not just x because it says both hence x+x = 2x )

please advice :)

have a fantastic day :)


\(x\) is a variable here and variable must represent only one particular unknown quantity. For any other unknown quantity you need to define a different variable. Here unknown quantity is number of people who have BOTH a degree and at least 4 years of experience. Same individual will posses both the characteristics.
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Re: Of 30 applicants for a job, 14 had at least 4 years' [#permalink]

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New post 11 Mar 2018, 04:23
niks18 wrote:
dave13 wrote:

Hi niks18, thanks for a nice question :) i am more than happy to explain :)

let me explain my logic :)

total applicants 30

14 at least have 4 years` experience

18 - have degrees

3 - had less than 4 years experience and dont have experinence

now question: How many of the applicants had at least 4 years' experience and a degree ?

hence let number of applicants who had both at least 4 yrs experience and a degree be 2x (why 2 and not just x because it says both hence x+x = 2x )

please advice :)

have a fantastic day :)


\(x\) is a variable here and variable must represent only one particular unknown quantity. For any other unknown quantity you need to define a different variable. Here unknown quantity is number of people who have BOTH a degree and at least 4 years of experience. Same individual will posses both the characteristics.



ok i think now i got it :) thank you :-)

# of total applicants = \(30\)

# of apllicants with at least have 4 years` experience = \(14\)

# of applicants with degrees = \(18\)

# of applicants had less than 4 years experience and dont have experinence = \(3\)

# of applicants who had BOTH at least 4 years' experience and a degree = \(x\)

\(14+18-x+3=30\)

\(35-x=30\)

\(5 = x\)
Re: Of 30 applicants for a job, 14 had at least 4 years'   [#permalink] 11 Mar 2018, 04:23
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