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# When the positive integer M is divided by the positive integer y, the

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Manager
Joined: 01 Sep 2016
Posts: 207
GMAT 1: 690 Q49 V35
When the positive integer M is divided by the positive integer y, the [#permalink]

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17 Sep 2017, 09:46
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Difficulty:

95% (hard)

Question Stats:

44% (01:44) correct 56% (02:32) wrong based on 52 sessions

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When the positive integer M is divided by the positive integer y, the quotient is 11 and the remainder is z. When you divide z by y, the remainder is 9. Which of the following could be the value of M ?

1. 108
2. 119
3. 20
4. 30

A) 1, 2 and 3
b) 1 and 2 only
c) 3 only
d) 1, 2, 3 and 4
e) 2 only
[Reveal] Spoiler: OA

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Intern
Joined: 29 Jun 2014
Posts: 29
Re: When the positive integer M is divided by the positive integer y, the [#permalink]

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17 Sep 2017, 10:13
Answer is A .1 2 3 :solution...M/y= 11 +z/y...z/y =9...So m = 11y + 9...choose y =1, 9,10

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Manager
Joined: 01 Sep 2016
Posts: 207
GMAT 1: 690 Q49 V35
Re: When the positive integer M is divided by the positive integer y, the [#permalink]

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17 Sep 2017, 10:18
vishwajeet2015 wrote:
Answer is A .1 2 3 :solution...M/y= 11 +z/y...z/y =9...So m = 11y + 9...choose y =1, 9,10

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My friend that's wrong. You did the logic right, but missed an important fundamental. Do you want to give it another shot? Let me know and I ll post the explanation if you need. Thanks
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we shall fight on the beaches,
we shall fight on the landing grounds,
we shall fight in the fields and in the streets,
we shall fight in the hills;
we shall never surrender!

Senior Manager
Joined: 02 Jul 2017
Posts: 290
GMAT 1: 730 Q50 V38
Re: When the positive integer M is divided by the positive integer y, the [#permalink]

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17 Sep 2017, 10:58
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Tricky one if we miss the basics. Find below detailed explanation

When the positive integer M is divided by the positive integer y, the quotient is 11 and the remainder is z. => $$M =11y+z$$
=> Here $$z < y$$ (That's the case only then reminder can be z)

When you divide z by y, the remainder is 9. => as $$z < y$$ and when z is divided by y remainder is 9 => $$z=9$$

So our equation is $$M =11y +9$$ for $$z<y$$

Which of the following could be the value of M ?
So lets write all the numbers in form of above equation. If it satisfies the equation than value can be equal to M
So general steps for such kind of questions : Subtract 9 from number and see if its a multiple of 11. if condition satisfies then number can be value of M

1. 108
=> 108 - 9 =99 so as 99 is multiple of 11 this can be our answer. Wrong
Lets write it in equation form : 108 = 11*9 +9 . So if we compare it with M=11y + z => y=z=9 not possible as z<y always
So this value is not M

2. 119
=> 119 - 9 =110 so as 110 is multiple of 11 this can be our answer.
Lets write it in equation form : 119 = 11*10 +9 . So if we compare it with M=11y + z => y=10 and z =9 => z<y satisfies our equation
So this can be value of M

3. 20
=> 20 - 9 =11 so as 11 is multiple of 11 this can be our answer. Wrong
Lets write it in equation form : 20 = 11*1 +9 . So if we compare it with M=11y + z => y=1 and z =9 => z>y. This can't be true as by our equation z<y always
So this value is not M

4. 30
=> 30 -9 =21 This cant be written in multiple of 11.
So this value is not M

A) 1, 2 and 3
b) 1 and 2 only
c) 3 only
d) 1, 2, 3 and 4
e) 2 only

Intern
Joined: 29 Jun 2014
Posts: 29
Re: When the positive integer M is divided by the positive integer y, the [#permalink]

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17 Sep 2017, 11:04
[SMILING FACE WITH SMILING EYES]pretty sue wnt make dat mistake ever again...thnx a ton

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Director
Joined: 07 Dec 2014
Posts: 927
Re: When the positive integer M is divided by the positive integer y, the [#permalink]

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17 Sep 2017, 20:44
1
KUDOS
bkpolymers1617 wrote:
When the positive integer M is divided by the positive integer y, the quotient is 11 and the remainder is z. When you divide z by y, the remainder is 9. Which of the following could be the value of M ?

1. 108
2. 119
3. 20
4. 30

A) 1, 2 and 3
b) 1 and 2 only
c) 3 only
d) 1, 2, 3 and 4
e) 2 only

if remainder is less than divisor,
then y>9
let y=10
M=10*11=110+z
only option>110 is 119
E
Re: When the positive integer M is divided by the positive integer y, the   [#permalink] 17 Sep 2017, 20:44
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# When the positive integer M is divided by the positive integer y, the

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