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Intern  Joined: 19 Nov 2004
Posts: 44
How many possible integer values are there for x if |4x - 3|  [#permalink]

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6
20 00:00

Difficulty:   45% (medium)

Question Stats: 62% (01:21) correct 38% (01:24) wrong based on 1317 sessions

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How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

What I did here was to separate two scenarios:
a. 4x – 3 < 6 and
b. 4x – 3 > - 6

I simplified x in both scenarios that I ended up in a range of -2.25 < x < .75
Therefore, my answer is 3 integers (-2, -1, 0)

I would like to know if this method is correct and if I should use such method for problems that involve absolute value and inequality.

Originally posted by cpcalanoc on 19 Dec 2004, 18:33.
Last edited by Bunuel on 20 Oct 2013, 04:03, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
##### Most Helpful Expert Reply
Math Expert V
Joined: 02 Sep 2009
Posts: 55271
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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9
14
How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

$$|4x - 3| < 6$$;

Get rid of the modulus: $$-6<4x-3< 6$$;

Add 3 to all three parts: $$-3<4x< 9$$;

Divide by 4: $$-\frac{3}{4}<x< \frac{9}{4}$$ --> $$-0.75<x< 2.25$$.

x can take following integer values: 0, 1, and 2.

Answer: C.
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##### General Discussion
Manager  Joined: 26 Dec 2003
Posts: 218
Location: India

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u can do this way. Directly substitute the value of x by trial and error method . Start from 0 and move on. u will get 0,1 and 2 as it asked for positive integers
Manager  Joined: 19 Nov 2004
Posts: 58

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3
1
Cpcalanoc you choose the right way BUT from 4x-3<6 => 4x<9 =>
x<2.25
the same mistake in the other

So -0.75 < x < 2.25
then the answer (0, 1, 2)

to Rakesh1239 your answer is right but where you see the word positive?
SVP  Joined: 06 Sep 2013
Posts: 1660
Concentration: Finance
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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cpcalanoc wrote:
How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

What I did here was to separate two scenarios:
a. 4x – 3 < 6 and
b. 4x – 3 > - 6

I simplified x in both scenarios that I ended up in a range of -2.25 < x < .75
Therefore, my answer is 3 integers (-2, -1, 0)

I would like to know if this method is correct and if I should use such method for problems that involve absolute value and inequality.

You can try algebraically, If x>=0, then you will have the range 0<=x<9/4
If x<0, you get x>3/4 but this solution is not valid so x must vbe x>=0. Hence, you have 3 integer solutions from the above inequality: 0, 1 and 2.

Hope this helps
Cheers
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GMAT 1: 530 Q39 V23 GMAT 2: 560 Q42 V26 GPA: 3.5
WE: Consulting (Computer Hardware)
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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1
2
[quote="cpcalanoc"]How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

Solution: |4x-3| < 6

let 4x=a therefore we have |a-3| < 6 ==> read this as origin is at +3 and we have to move +6 to the right and -6 to the left

(the less than sign represents that the a must be within boundaries )

(3-6)----------3----------(3+6)

now, we have -3<a<9

but a =4x ==> -3<4x<9

dividing all values by +4 we have -0.75 <x < 2.24

Now question says Integer values (not rational ) therefore we have 0,1,2

Hence 3
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Joined: 25 Mar 2013
Posts: 238
Location: United States
Concentration: Entrepreneurship, Marketing
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Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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My Strategy , X is an integer ( + , - , 0 )
Principles : Integers ,Module and Inequality
Plug In Method Start with 0 , 1 , -1 , 2 as values
By Plugging in |4x - 3| < 6 Is Yes for 0 , 1, 2 But not with -1 So 3 Values After seeing Bunnel solution we can use Module Basics with a Range in Number line
-6<4x - 3< 6 , -3<4x<9 , \frac {3}{4} <x< \frac{9}{4}, So - 0,75<x< 2.25
So Range from 0 , 1 , 2

If any wrong or any Suggestions in my Strategy pls Correct it
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Intern  Joined: 10 Apr 2014
Posts: 32
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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kanusha wrote:
My Strategy , X is an integer ( + , - , 0 )
Principles : Integers ,Module and Inequality
Plug In Method Start with 0 , 1 , -1 , 2 as values
By Plugging in |4x - 3| < 6 Is Yes for 0 , 1, 2 But not with -1 So 3 Values After seeing Bunnel solution we can use Module Basics with a Range in Number line
-6<4x - 3< 6 , -3<4x<9 , \frac {3}{4} <x< \frac{9}{4}, So - 0,75<x< 2.25
So Range from 0 , 1 , 2

If any wrong or any Suggestions in my Strategy pls Correct it

your strategy is good but suppose if you have lot of integers, how many will you keep plugging?

The second method is better as you quickly know the range and based on conceptual understanding.

given 4x - 3 can take both positive and negative values. It can lie between -6 and 0 or 0 and +6.
Manager  Joined: 08 Sep 2010
Posts: 58
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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Bunuel wrote:
How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

$$|4x - 3| < 6$$;

Get rid of the modulus: $$-6<4x-3< 6$$;

Add 3 to all three parts: $$-3<4x< 9$$;

Divide by 4: $$-\frac{3}{4}<x< \frac{9}{4}$$ --> $$-0.75<x< 2.25$$.

x can take following integer values: 0, 1, and 2.

Answer: C.

@Bunuel - The question stems talks about how many positive integer values of x. IF we are talking about positive integer then it should be only {1,2} and not {0).
Am I missing anything here?
Math Expert V
Joined: 02 Sep 2009
Posts: 55271
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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chanakya84 wrote:
Bunuel wrote:
How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

$$|4x - 3| < 6$$;

Get rid of the modulus: $$-6<4x-3< 6$$;

Add 3 to all three parts: $$-3<4x< 9$$;

Divide by 4: $$-\frac{3}{4}<x< \frac{9}{4}$$ --> $$-0.75<x< 2.25$$.

x can take following integer values: 0, 1, and 2.

Answer: C.

@Bunuel - The question stems talks about how many positive integer values of x. IF we are talking about positive integer then it should be only {1,2} and not {0).
Am I missing anything here?

The question does not specify that the integers must be positive: "how many possible integer values are there for x..."

Hope it's clear.
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Manager  Joined: 08 Sep 2010
Posts: 58
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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Bunuel wrote:
chanakya84 wrote:
Bunuel wrote:
How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

$$|4x - 3| < 6$$;

Get rid of the modulus: $$-6<4x-3< 6$$;

Add 3 to all three parts: $$-3<4x< 9$$;

Divide by 4: $$-\frac{3}{4}<x< \frac{9}{4}$$ --> $$-0.75<x< 2.25$$.

x can take following integer values: 0, 1, and 2.

Answer: C.

@Bunuel - The question stems talks about how many positive integer values of x. IF we are talking about positive integer then it should be only {1,2} and not {0).
Am I missing anything here?

The question does not specify that the integers must be positive: "how many possible integer values are there for x..."

Hope it's clear.

Ahh..my mistake....
Read the question wrong.
Current Student B
Status: DONE!
Joined: 05 Sep 2016
Posts: 372
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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You can figure this out by taking the equation and solving:

SCENARIO 1:
(4x - 3) < 6
4x<9
x<(9/4)

SCENARIO 2:
(4x - 3) > -6
4x>-3
x>(-3/4)

So (-0.75)<x<2.25 --> The only integers within this range are 0,1,2 --> Hence, 3 is the correct answer (C)
Intern  B
Joined: 06 May 2017
Posts: 5
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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Hi,
I think answer will be B. We can get 1,2 .zero is neither positive or negative and question is asking for positive values only.

PS
Any number to the left of zero on a number line; can be integer or non-integer. Note: The number zero is neither positive nor negative

Posted from my mobile device
Math Expert V
Joined: 02 Sep 2009
Posts: 55271
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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paritesh wrote:
Hi,
I think answer will be B. We can get 1,2 .zero is neither positive or negative and question is asking for positive values only.

PS
Any number to the left of zero on a number line; can be integer or non-integer. Note: The number zero is neither positive nor negative

Posted from my mobile device

Please read carefully. The question does not specify that the integers must be positive: "how many possible integer values are there for x..."

P.S. This doubt is already addressed above. Please read the whole thread before posting. Thank you.
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Intern  B
Joined: 06 May 2017
Posts: 5
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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Thanks,I got it I didn't read the question properly

Posted from my mobile device
Manager  G
Joined: 12 Feb 2017
Posts: 70
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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|4x - 3| < 6
remove the modulus
Case 1)
4x-3 <6
4x<9
x<9/4
x<2.25

Case 2)
-(4x-6)<6
4x-3>-6
4x>-3
x>-3/4
x>-0.75
Hence -0.75 < x < 2.25

Therefore only possible values for x are 0,1,2.

Hence Option C.

Kudos if it helps.
Senior Manager  S
Joined: 15 Jan 2017
Posts: 351
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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Bunuel wrote:
How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

$$|4x - 3| < 6$$;

Get rid of the modulus: $$-6<4x-3< 6$$;

Add 3 to all three parts: $$-3<4x< 9$$;

Divide by 4: $$-\frac{3}{4}<x< \frac{9}{4}$$ --> $$-0.75<x< 2.25$$.

x can take following integer values: 0, 1, and 2.

Answer: C.

Hi! Why is zero seen as an integer here? I understand 1,2 but zero isn't counted as an integer. Please correct my understanding. Thank you!
Math Expert V
Joined: 02 Sep 2009
Posts: 55271
Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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Madhavi1990 wrote:
Bunuel wrote:
How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

$$|4x - 3| < 6$$;

Get rid of the modulus: $$-6<4x-3< 6$$;

Add 3 to all three parts: $$-3<4x< 9$$;

Divide by 4: $$-\frac{3}{4}<x< \frac{9}{4}$$ --> $$-0.75<x< 2.25$$.

x can take following integer values: 0, 1, and 2.

Answer: C.

Hi! Why is zero seen as an integer here? I understand 1,2 but zero isn't counted as an integer. Please correct my understanding. Thank you!

ZERO:

1. 0 is an integer.

2. 0 is an even integer. An even number is an integer that is "evenly divisible" by 2, i.e., divisible by 2 without a remainder and as zero is evenly divisible by 2 then it must be even.

3. 0 is neither positive nor negative integer (the only one of this kind).

4. 0 is divisible by EVERY integer except 0 itself.

Brush up fundamentals before attempting questions:

ALL YOU NEED FOR QUANT ! ! !
Ultimate GMAT Quantitative Megathread

Hope it helps.
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Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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cpcalanoc wrote:
How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

What I did here was to separate two scenarios:
a. 4x – 3 < 6 and
b. 4x – 3 > - 6

I simplified x in both scenarios that I ended up in a range of -2.25 < x < .75
Therefore, my answer is 3 integers (-2, -1, 0)

I would like to know if this method is correct and if I should use such method for problems that involve absolute value and inequality.

Question: Number of possible values of x which are integer?

Given: |4x - 3| < 6

-6+3 < 4x < 6+3

-3/4 < x < 9/4

-0.75 < x < 2.25

values are 0, 1, 2 (Three integer values)

(C)
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Re: How many possible integer values are there for x if |4x - 3|  [#permalink]

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cpcalanoc wrote:
How many possible integer values are there for x if |4x - 3| < 6 ?

A. One
B. Two
C. Three
D. Four
E. Five

We can first solve when the expression (4x - 3) is positive:

4x - 3 < 6

4x < 9

x < 9/4 = 2 ¼

Now we can solve when the expression (4x - 3) is negative:

-(4x - 3) < 6

-4x + 3 < 6

-4x < 3

x > -3/4
Thus:

-3/4 < x < 2 1/4

So x can be any of 3 integer values: 0, 1, or 2.

Answer: C
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