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x, y, a, and b are positive integers. When x is divided by y

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Director
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Status: Preparing for the 4th time -:(
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x, y, a, and b are positive integers. When x is divided by y [#permalink] New post 19 Jan 2012, 16:07
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A
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E

Difficulty:

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Question Stats:

72% (01:46) correct 28% (01:27) wrong based on 93 sessions
x, y, a, and b are positive integers. When x is divided by y, the remainder is 6. When a is divided by b, the remainder is 9. Which of the following is NOT a possible value for y + b?

A. 24
B. 21
C. 20
D. 17
E. 15

[Reveal] Spoiler:
My answer is A as I can get other values. But the OA is not given. What I am keen on asking is "I have solved this question by picking the values for x,y,a and b. Is there any shortcut and do you guys agree with my answer?
[Reveal] Spoiler: OA

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E.

MGMAT 1 --> 530
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MGMAT 3 ---> 610 :-(

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Re: NOT A VALUE [#permalink] New post 19 Jan 2012, 16:29
Expert's post
enigma123 wrote:
x, y, a, and b are positive integers. When x is divided by y, the remainder is 6. When a is divided by b, the remainder is 9. Which of the following is NOT a possible value for y + b?
a)24
b)21
c)20
d)17
e)15

My answer is A as I can get other values. But the OA is not given. What I am keen on asking is "I have solved this question by picking the values for x,y,a and b. Is there any shortcut and do you guys agree with my answer?


Important note: remainder is ALWAYS less than divisor, thus y>6 and b>9 --> y+b>15.

Answer: E.
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Director
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Status: Preparing for the 4th time -:(
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GMAT Tests User
Re: x, y, a, and b are positive integers. When x is divided by y [#permalink] New post 24 Jan 2012, 17:35
Thanks for the tip.
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Best Regards,
E.

MGMAT 1 --> 530
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MGMAT 3 ---> 610 :-(

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Joined: 10 Jan 2010
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GMAT Tests User
Re: x, y, a, and b are positive integers. When x is divided by y [#permalink] New post 25 Jan 2012, 01:01
Sometimes the answers is so easy. U just need to figure it out. :) Thanks Bunuel

I picked "E" too, but tried to figure it out by picking numbers. Took me ages
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Re: x, y, a, and b are positive integers. When x is divided by y [#permalink] New post 25 Jan 2012, 03:59
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Expert's post
enigma123 wrote:
x, y, a, and b are positive integers. When x is divided by y, the remainder is 6. When a is divided by b, the remainder is 9. Which of the following is NOT a possible value for y + b?
a)24
b)21
c)20
d)17
e)15

My answer is A as I can get other values. But the OA is not given. What I am keen on asking is "I have solved this question by picking the values for x,y,a and b. Is there any shortcut and do you guys agree with my answer?


I would suggest you to analyze each statement as you read it. Often, you will find that you are very close to the answer by the time you read the last sentence of the question.

"When x is divided by y, the remainder is 6."
Here, I say to myself, "Ok, so y must be greater than 6 and x is either 6 or at least 6 greater than y."

If you are not sure how I deduced this, check out these posts:
http://www.veritasprep.com/blog/2011/04 ... unraveled/
http://www.veritasprep.com/blog/2011/04 ... y-applied/
If y is anything less than 6, you can make one more group!

When a is divided by b, the remainder is 9.
Now I say, "b must be greater than 9 and a is either 9 or at least 9 greater than y."

Which of the following is NOT a possible value for y + b
I already know that y must be greater than 6 and b must be greater than 9. So (y+b) must be greater than 15. Now I will just look for an option <= 15
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Re: x, y, a, and b are positive integers. When x is divided by y [#permalink] New post 26 Jul 2014, 21:00
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Re: x, y, a, and b are positive integers. When x is divided by y   [#permalink] 26 Jul 2014, 21:00
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