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If x is an integer, what is the value of x?

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If x is an integer, what is the value of x? [#permalink] New post 18 Sep 2013, 14:38
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If x is an integer, what is the value of x?

(1) \(\frac{1}{5}<\frac{1}{x+1}<\frac{1}{2}\)
(2) (x-3)(x-4)=0
[Reveal] Spoiler: OA

Last edited by Bunuel on 18 Sep 2013, 14:45, edited 1 time in total.
Edited the question.
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Re: If x is an integer, what is the value of x? [#permalink] New post 18 Sep 2013, 14:48
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If x is an integer, what is the value of x? [#permalink] New post 30 Oct 2014, 15:25
If x is an integer, what is the value of x?

(1) \(\frac{1}{5}<\frac{1}{x+1}<\frac{1}{2}\)

(2) \((x-3) (x-4) = 0\)

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Re: If x is an integer, what is the value of x? [#permalink] New post 30 Oct 2014, 21:35
dmmk wrote:
If x is an integer, what is the value of x?

(1) \(\frac{1}{5}<\frac{1}{x+1}<\frac{1}{2}\)

(2) \((x-3) (x-4) = 0\)

Source: New Oriental Education and technology group


C.

1) 1/5 < 1/(x+1) < 1/2
or 2 < (x+1) < 5
or 1 < x < 4
x = 2 or 3
insufficient.

2) (x-3)(x-4) = 0
x=3 or 4
insufficient.

(1)+(2) --> x = 3
sufficient.
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Re: If x is an integer, what is the value of x? [#permalink] New post 31 Oct 2014, 02:48
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Re: If x is an integer, what is the value of x? [#permalink] New post 07 Nov 2014, 04:34
thefibonacci wrote:
dmmk wrote:
If x is an integer, what is the value of x?

(1) \(\frac{1}{5}<\frac{1}{x+1}<\frac{1}{2}\)

(2) \((x-3) (x-4) = 0\)

Source: New Oriental Education and technology group


C.

1) 1/5 < 1/(x+1) < 1/2
or 2 < (x+1) < 5
or 1 < x < 4
x = 2 or 3
insufficient.

2) (x-3)(x-4) = 0
x=3 or 4
insufficient.

(1)+(2) --> x = 3
sufficient.



1/5 < 1/(x+1) < 1/2
or 2 < (x+1) < 5

How do you get this? Could you please explain
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Re: If x is an integer, what is the value of x? [#permalink] New post 07 Nov 2014, 05:33
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anupamadw wrote:
thefibonacci wrote:
dmmk wrote:
If x is an integer, what is the value of x?

(1) \(\frac{1}{5}<\frac{1}{x+1}<\frac{1}{2}\)

(2) \((x-3) (x-4) = 0\)

Source: New Oriental Education and technology group


C.

1) 1/5 < 1/(x+1) < 1/2
or 2 < (x+1) < 5
or 1 < x < 4
x = 2 or 3
insufficient.

2) (x-3)(x-4) = 0
x=3 or 4
insufficient.

(1)+(2) --> x = 3
sufficient.



1/5 < 1/(x+1) < 1/2
or 2 < (x+1) < 5

How do you get this? Could you please explain


From 1/5 < 1/(x+1) we know that x+1 must be positive so, we can cross-multiply to get x+1 < 5. The same way from 1/(x+1) < 1/2 we get 2 < x+1. Therefore 2 < x+1 < 5.

Hope it's clear.
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If x is an integer, what is the value of x? [#permalink] New post 08 Oct 2015, 06:47
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Re: If x is an integer, what is the value of x? [#permalink] New post 08 Oct 2015, 09:08
Bunuel wrote:
If x is an integer, what is the value of x?

(1) 1/5 < 1/(1 + x) < 1/2
(2) (x – 3)(x – 4) = 0


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(1) from this expression we can say x must be +ve -> 5>1+x>2 4>x>1 NOT Sufficient as x could be 2 or 3
(2) x=3 or 4 Not Sufficient
(1+2) X=3 Answer (C)
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Re: If x is an integer, what is the value of x? [#permalink] New post 08 Oct 2015, 09:51
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Bunuel wrote:
If x is an integer, what is the value of x?

(1) 1/5 < 1/(1 + x) < 1/2
(2) (x – 3)(x – 4) = 0


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Question : x = ?

Statement 1: 1/5 < 1/(1 + x) < 1/2
i.e. 1+x = 3 or 4
i.e. x = 2 or 3
NOT SUFFICIENT

Statement 2: (x – 3)(x – 4) = 0
i.e. x = 3 or x = 4
NOT SUFFICIENT

Combining the two statements
x = 3 is the only common solution

Answer: Option C
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Re: If x is an integer, what is the value of x? [#permalink] New post 08 Oct 2015, 20:24
If x is an integer, what is the value of x?

(1) 1/5 < 1/(1 + x) < 1/2
(2) (x – 3)(x – 4) = 0


Kudos for a correct solution.

Hi Bunuel ,
If i am wrong at st 1 using the inequality .please correct me and show the correct approach for this kind of inequality .


St (1) 1/5 < 1/(1 + x) < 1/2

As x integer -- it can be positive and negative .

so we cant cross multiple and solve the the above st .

not sufficient .

St 2
(x – 3)(x – 4) = 0
So can x is either 3 or 4


Not sufficient


Together ---- putting the value of x = 3 or 4 from st 2 and putting them in st 1

1/5 < 1/(1 + x) < 1/2
x= 3
0.2 < 0.3 <0.5

x=4
0.2 < 0.25 < 0.5

Hence together not sufficient .

E ans
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Re: If x is an integer, what is the value of x? [#permalink] New post 08 Oct 2015, 21:53
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(1) 1/5 < 1/(1 + x) < 1/2
From this statement, we can say 5>(1+x)>2, so x= 2 or 3....Insufficient

(2) (x – 3)(x – 4) = 0
x=3 or 4...Insufficient.

From both the statements...x=3. Hence, ans 'C'.
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Re: If x is an integer, what is the value of x? [#permalink] New post 09 Oct 2015, 21:25
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abhisheknandy08 wrote:
If x is an integer, what is the value of x?

(1) 1/5 < 1/(1 + x) < 1/2
(2) (x – 3)(x – 4) = 0


Kudos for a correct solution.

Hi Bunuel ,
If i am wrong at st 1 using the inequality .please correct me and show the correct approach for this kind of inequality .


St (1) 1/5 < 1/(1 + x) < 1/2

As x integer -- it can be positive and negative .

so we cant cross multiple and solve the the above st .

not sufficient .



The Highlighted statement is Incorrect because x can't be Negative for 1/5 < 1/(1 + x) < 1/2 to be true

for the above mentioned Inequation to be true

(x+1) must lie between 2 and 5

i.e. 2 < (x+1) < 5
i.e. 2-1 < (x) < 5-1
i.e. 1 < (x) < 4

I hope this helps!
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Re: If x is an integer, what is the value of x? [#permalink] New post 10 Oct 2015, 17:55
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Answer is C.

1. is not sufficient as x can assume multiple values
2. x=3 or x=4. No unique value. Not Sufficient

1. and 2. sufficient. x=3
Re: If x is an integer, what is the value of x?   [#permalink] 10 Oct 2015, 17:55
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