If y is an integer, then the least possible value of |23 - 5y| is

Question

(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

Bunuel · Accepted Answer

SOLUTION

If y is an integer, then the least possible value of |23 - 5y| is

(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

|23-5y|  represents the distance between 23 and  5y  on the number line. Now, the distance will be minimized when  5y , which is multiple of 5, is closest to 23. Multiple of 5 which is closest to 23 is 25 (for  y=5 ), so the least distance is 2:  |23-25|=2 .

Answer: B.

hamm0 · Answer

To find the value of y that yields that minimum for |23 - 5y|, I tested numbers (integers).

1: |23-5( 1 )| = 18
2: |23-5( 2 )| = 13
3: |23-5( 3 )| = 8
4: |23-5( 4 )| = 3
5: |23-5( 5 )| = 2
6: |23-5( 6 || = 7
7: |23-5( 7 )| = 12

The correct answer is B, 2.

This is a rather simple problem that can be figured out well under the 2 minute allowance - that said, it is a bit of a trap if you're not paying attention, and mark 5 instead of 2, as 5 is the value of y that yields the answer of 2.

EvaJager · Answer

|23-5y|  is the distance between  23  and the integer multiple of  5 ,  5y . 
So, the question is asking for the smallest distance between a multiple of  5  and  23 .
Since  20=4\cdot5<23<5\cdot5=25  and  23  is closer to  25  than to  20 , the answer is  |23-25|=2 .

Answer B.

fameatop · Answer

If y is an integer, then the least possible value of |23 - 5y| is
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

The integers which are multiple of 5 & closest to 23 on the number line are either 20 or 25. 
Thus the minimum distance possible is 2 units 
Answer B

ratinarace · Answer

Since absolute value stands for the distance on the number line. The question asks for a shortest distance between 23 and a multiple of 5. 25 is the multilple of 5 that is closest to 23 with a shortest distance of 2. 5 is the value of y that shall yield 25 and hence the answer is E

Psy881212 · Answer

When they asked least possible value, I was thinking of the value with the lowest probability and figured it could either be 1 4 and 5. Didnt think that they were asking what is the closest value

EMPOWERgmatRichC · Answer

Hi Psy881212,

GMAT writers are never trying to 'trick' you, so 'Probability' questions on the GMAT almost always include the word "probability" in the prompt. Here, the phrase "least possible value" means "smallest value that you can possibly end with given the restrictions in the prompt" (it does NOT mean "least likely value"). As you continue to practice with Official materials, you'll get a better sense of the 'style' that GMAT writers use (and that familiarity will lead to certain advantages on Test Day).

GMAT assassins aren't born, they're made,
Rich

ScottTargetTestPrep · Answer

To solve this question, we must make sure we interpret it correctly. We are not finding the least possible value of y, but rather the least possible value of |23-5y| (the absolute value of 23 – 5y). Remember that the smallest value that can result from taking the absolute value is zero. Thus we need to make 23 - 5y as close to zero as possible.

We know that 5y is a multiple of 5, so let’s first look at the multiples of 5 closest to 23. We have “20” and “25”. Let’s subtract both of these from 23 and see which one produces the smallest result. When 5y = 20, y is 4 and when 5y = 25, y is 5. Let’s start with letting y = 4.

|23-5(4)|

|23-20|

|3| = 3

Next, let’s let y equal 5.

|23-5(5)|

|23-25|

|-2| = 2

We see that the smallest possible value of |23-5y| is 2.

Answer B.

Another approach to solving this problem is to see what value of y makes the expression 23 – 5y equal to 0:

23 – 5y = 0

23 = 5y

y = 4.6

However, we know that y must be an integer, so we round y = 4.6 to y = 5.

We then plug the value 5 for y into the absolute value equation, as was done earlier, yielding the same answer of 2, which is answer choice B.

BrentGMATPrepNow · Answer

Another approach is to  check each answer choice  to see if it COULD be the smallest possible value of |23 - 5y|

Let's start with answer choice A, since it is the smallest answer.

A) 1 
Is it possible that |23 - 5y| = 1 if y MUST BE AN INTEGER? 
Let's solve it. 
If |23 - 5y| = 1, then 23 - 5y = 1 or 23 - 5y = -1

Take 23 - 5y = 1 and subtract 23 from both sides to get: -5y = -22
Solve to get: y = 4.4 NOT an integer

Take 23 - 5y = -1 and subtract 23 from both sides to get: -5y = -24
Solve to get: y = 4.8 NOT an integer

So, if y is an INTEGER, it's IMPOSSIBLE for |23 - 5y| to equal 1
ELIMINATE A

B) 2 
Is it possible that |23 - 5y| = 2 if y MUST BE AN INTEGER? 
Let's solve it. 
If |23 - 5y| = 2, then 23 - 5y = 2 or 23 - 5y = -2

Take 23 - 5y = 2 and subtract 23 from both sides to get: -5y = -21
Solve to get: y = 4.2 NOT an integer

Take 23 - 5y = -2 and subtract 23 from both sides to get: -5y = -25
Solve to get: y = 5 AN INTEGER

AHA! It IS POSSIBLE for |23 - 5y| to equal 2

Answer: B

sujoykrdatta · Answer

We need to make (23 - 5y) as close to '0' as possible

23 - 5y = 0
=> y = 4.6

However, y is an integer

Thus, we need to work with y = 4 or 5, whichever makes 23 - 5y closer to '0'

For y = 4: 23 - 5y = 3 => |23 - 5y| = 3

For y = 5: 23 - 5y = -2 => |23 - 5y| = 2

Thus, the minimum value of |23 - 5y| = 2

Answer B

GMATCoachBen · Answer

First, make sure we understand what it's asking for — " the least possible value  of |23 - 5y|"

In general, it can be helpful to visualize |A - B| as "the distance between A and B on a number line". Therefore, our next step is to figure out the value of "5y" that is closest to "23" (see below for illustration).

Also, note that the absolute value cannot be negative. So, we are looking for the value of |23 - 5y| that is closest to zero.

We could make a full table, but the easiest way is to think of multiples of 5 that are closest to 23 ("5y" must be a multiple of 5, since y is an integer). 
What happens if we plug in "20" and "25" for the "5y"?
|23 - 20| = 3
|23 - 25| = |-2| =   2

Key Habit for Trap Avoidance   : We must always  read carefully and double-check what it's asking for before confirming our answer.

18% of people get trapped by "E" on this question , because the correct value for "y" is indeed "5". However, the question asks for "the least possible value of |23 - 5y|".

BrushMyQuant · Answer

Given that y is an integer and we need to find the least possible value of |23 - 5y|

Now, |23 - 5y| is Absolute Value/Modulus of a number and we know that Absolute Value of any number is always ≥ 0

=>  Minimum value of |23 - 5y| will be close to zero 
=> 23 - 5y should be close to 0

Since, y is an integer so let's take value of y in such a way that 23 - 5y is closer to 0
For y = 4
=> 23 - 5y = 23 - 5*4 = 3

For y = 5
=> 23 - 5y = 23 - 5*5 = -2

-2 is closer to 0 than 3
=> Minimum value of |23 - 5y| = |-2| = 2 (when y = 5)

So,  Answer will be B 
Hope it helps!

Watch the following video to learn How to Solve Absolute Value Problems

https://www.youtube.com/watch?v=rBWfl4AmQDI

Paras96 · Answer

If y is an integer, then the least possible value of |23 - 5y| is

Let x = |23 - 5y|, we know that due to the modulus operator, the minimum value of x could be zero
=> x= 0
=> |23-5y| = 0
=> 23-5y=0
=> y= 23/5 or 4.6 but because y is any integer, it can not take the value of 4.6.

Therefore, we will do hit and trial for the minimum value of x with keeping y=4 and y=5

Case I y=4
=> x = |23 - 5*4| = |23 - 20| = 3

Case II y=5
=> x = |23 - 5*5| = |23 - 25| = 2

Hence the minimum value is 2

Answer B

totaltestprepNick · Answer

B https://www.youtube.com/watch?v=UMc6hEwJcbA Nick Slavkovich, GMAT/GRE tutor with 20+ years of experience tutoring@totaltestprep.net

If y is an integer, then the least possible value of |23 - 5y| is

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If y is an integer, then the least possible value of |23 - 5y| is

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