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Manager  Joined: 12 Oct 2011
Posts: 106
GMAT 1: 700 Q48 V37 GMAT 2: 720 Q48 V40 If positive integer x is divided by 5, the result is p and  [#permalink]

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10 00:00

Difficulty:   25% (medium)

Question Stats: 74% (02:02) correct 26% (02:14) wrong based on 223 sessions

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If positive integer x is divided by 5, the result is p and the remainder 3. If x is divided by 11, the remainder is 3 again, what is the remainder when p is divided by 11?

(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

I had to plug in numbers, how can you solve this with the remainder formula?
Math Expert V
Joined: 02 Sep 2009
Posts: 58135
If positive integer x is divided by 5, the result is p and  [#permalink]

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5
BN1989 wrote:
If positive integer x is divided by 5, the result is p and the remainder 3. If x is divided by 11, the remainder is 3 again, what is the remainder when p is divided by 11?

(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

I had to plug in numbers, how can you solve this with the remainder formula?

If positive integer x is divided by 5, the result is p and the remainder 3: $$x=5p+3$$;
If positive integer x is divided by 11, the the remainder 3: $$x=11q+3$$;

Subtract one from another: $$x-x=(5p+3)-(11q+3)$$ --> $$5p=11q$$---> $$\frac{p}{q}=\frac{11}{5}$$ --> since both $$p$$ and $$q$$ are integers then $$p$$ must be a multiple of 11, so it yields remainder of zero upon division by 11.

Hope it's clear.
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Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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2
BN1989 wrote:
If positive integer x is divided by 5, the result is p and the remainder 3. If x is divided by 11, the remainder is 3 again, what is the remainder when p is divided by 11?

(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

I had to plug in numbers, how can you solve this with the remainder formula?

If the remainder is same in both the cases,
x = 5p + 3
x = 11q + 3

then x = 55a + 3
(to understand this concept, check out http://www.veritasprep.com/blog/2011/05 ... emainders/)

Since 5p has 55 as a factor, p must be divisible by 11. So remainder is 0
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Intern  Joined: 17 Feb 2012
Posts: 21
Schools: LBS '14
Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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1
Since X-3 is divisible both by 5 and by 11,which are prime numbers, so P/11 or X-3/11 will always be with remainder 0
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Math Expert V
Joined: 02 Sep 2009
Posts: 58135
Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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1
3
ENAFEX wrote:
Bunuel, I tried using this method below as described in

http://gmatclub.com/forum/manhattan-remainder-problem-93752.html#p721341

X=5P+3 , x can be 8 13 18 23...58
X=11Q+3, x can be 14,25,....58

To form the equation n=kx+r
n=55K+58

Not sure how to proceed.

First of all you don't need to use that approach to solve the problem.

Next, you are making a mistake while deriving a general formula.

Positive integer x is divided by 5, the result is p and the remainder 3: $$x=5p+3$$ --> $$x$$ can be: 3, 8, 13, ... Notice that the least value of $$x$$ for which it gives the remainder of 3 upon division by 5 is 3 itself: 3 divided by 5 yields remainder of 3.

Positive integer x is divided by 11, the the remainder 3: $$x=11q+3$$ --> $$x$$ can be: 3, 14, 25, ... Th same here the least value of $$x$$ is 3: 3 divided by 11 yields remainder of 3.

General formula would be: $$x=55k+3$$.

Check the problems below for which you can use this approach:
positive-integer-n-leaves-a-remainder-of-4-after-division-by-93752.html
if-n-is-a-positive-integer-greater-than-16-is-n-a-prime-129829.html
when-positive-integer-x-is-divided-by-5-the-remainder-is-128470.html
when-n-is-divided-by-5-the-remainder-is-2-when-n-is-divided-82624.html
when-positive-integer-n-is-divided-by-5-the-remainder-is-90442.html
when-the-positive-integer-a-is-divided-by-5-and-125591.html
what-is-the-value-of-length-n-100-meter-of-wire-126500.html
a-group-of-n-students-can-be-divided-into-equal-groups-of-126384.html
when-the-positive-integer-a-is-divided-by-5-and-7-the-104480.html
positive-integer-n-leaves-a-remainder-of-4-after-division-by-93752.html
when-positive-integer-n-is-divided-by-3-the-remainder-is-86155.html

Hope it helps.
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Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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1
x=5p+3;
x=11q+3

So, 5p+3=11q+3..
5p=11q
p=11(q/5)

P should be a multiple of 11... & p divided by 11 should give R=0
Manager  Joined: 22 Feb 2009
Posts: 157
Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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1
BN1989 wrote:
If positive integer x is divided by 5, the result is p and the remainder 3. If x is divided by 11, the remainder is 3 again, what is the remainder when p is divided by 11?

(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

I had to plug in numbers, how can you solve this with the remainder formula?

When we got 5p = 11k, since 5 and 11 is prime number -> k must be divisible by 5 and p must be divisible by 11 -> A is correct
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Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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I got this wrong....

I tried to plug in numbers but didn't manage to get it. Then just guessed

@ Bunuel : Kudos of the explanation
@ BN1989 : Nice questions Kudos to u too
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Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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1
Bunuel, I tried using this method below as described in

http://gmatclub.com/forum/manhattan-remainder-problem-93752.html#p721341

X=5P+3 , x can be 8 13 18 23...58
X=11Q+3, x can be 14,25,....58

To form the equation n=kx+r
n=55K+58

Not sure how to proceed.
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Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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ENAFEX wrote:
Bunuel, I tried using this method below as described in

X=5P+3 , x can be 8 13 18 23...58
X=11Q+3, x can be 14,25,....58

To form the equation n=kx+r
n=55K+58

Not sure how to proceed.

Using the same approach, we know that at p=11 the value of X=58, for both the expressions. Hence p is a multiple of 11 so the remainder is 0.
Though this is still a more time consuming approach that the ones stated above.

Please correct me if I am wrong.

Nityam
Intern  Joined: 29 Jul 2012
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Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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Hi I have a quick question on this problem. How are you getting to 55 in the combined equation? Why can't X be 3? If you divide 3 by both 5 and 11, the remainder is 3 so I'm not sure what I am missing. Thanks for any help you can give.
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Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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aryah422 wrote:
Hi I have a quick question on this problem. How are you getting to 55 in the combined equation? Why can't X be 3? If you divide 3 by both 5 and 11, the remainder is 3 so I'm not sure what I am missing. Thanks for any help you can give.

I have discussed the general case there.

Given that:
x = 5p + 3
x = 11q + 3

We can say that x = 55a + 3
i.e. when we divide x by 55 (the LCM of 5 and 11), the remainder will be 3 in that case too.
To understand this fully, check out the link I gave in my previous post: http://www.veritasprep.com/blog/2011/05 ... emainders/

Sure, the number x can be 3 too. In that case p = 0, q = 0 and a = 0. When you divide p by 11, the remainder will be 0.
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Intern  Joined: 03 Feb 2016
Posts: 10
If positive integer x is divided by 5, the result is p and  [#permalink]

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I think I took the long road approaching this problem, not sure whether the correct one or not (after looking at the very simple and logical solution given by Bunuel), but this is the way I did it.

x= 5p+3
x=11q+3
p=11c+r

I substituted for p which lead to:

5(11c+r)+3=11q +r --> 5(11c+r)-11q=0 --> 55c+5r-11q=0 --> 11(5c-q)+5r=0. Given that r must be non negative, I concluded that in order for this equation to be 0, r must be equal to 0, as well. Please let me know if this conclusion is faulty.
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Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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Bunuel wrote:
BN1989 wrote:
If positive integer x is divided by 5, the result is p and the remainder 3. If x is divided by 11, the remainder is 3 again, what is the remainder when p is divided by 11?

(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

I had to plug in numbers, how can you solve this with the remainder formula?

If positive integer x is divided by 5, the result is p and the remainder 3: $$x=5p+3$$;
If positive integer x is divided by 11, the the remainder 3: $$x=11q+3$$;

Subtract one from another: $$x-x=(5p+3)-(11q+3)$$ --> $$5p=11q$$---> $$\frac{p}{q}=\frac{11}{5}$$ --> since both $$p$$ and $$q$$ are integers then $$p$$ must be a multiple of 11, so it yields remainder of zero upon division by 11.

Hope it's clear.

I also had the same line of thinking. thanks for all the guidance.
Intern  Joined: 17 Jun 2015
Posts: 3
Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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I have done via number estimation.
I have taken list of all multiple values of 11 [ 22,33,44,55,66, ..] and added 3 to each. That results to [25, 36, 47, 58, 69, ...]
58 satisfy with first rule provided in question stem. 58 / 5 = 11 * 5 + 3. Therefore when we divide 55 with 11, remainder is 0.
Manager  S
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Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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So 'result' = 'Quotient'?
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Re: If positive integer x is divided by 5, the result is p and  [#permalink]

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_________________ Re: If positive integer x is divided by 5, the result is p and   [#permalink] 05 Aug 2019, 03:51
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