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n is a positive integer, x = 7n + 2, and y = 6n + 3.

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n is a positive integer, x = 7n + 2, and y = 6n + 3. [#permalink] New post 10 May 2016, 07:20
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67% (00:40) correct 32% (00:35) wrong based on 52 sessions
n is a positive integer, x = 7n + 2, and y = 6n + 3.

Quantity A
Quantity B
The ones of x + y
5


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.




Practice Questions
Question: 3
Page: 62
[Reveal] Spoiler: OA

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Re: n is a positive integer, x = 7n + 2, and y = 6n + 3. [#permalink] New post 10 May 2016, 07:25
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Explanation

In the question, you are given that x = 7n + 2 and y = 6n + 3. Substituting the given expressions for x and y in Quantity A, you get x + y = 13n + 5.

Using trial and error, you can compare Quantity A, the ones digit of 13n + 5, and Quantity B, 5, by plugging in a few values for the positive integer n.

If n = 1, then x + y = 18 and the ones digit is 8, which is greater than 5. So in this case Quantity A is greater than Quantity B.
If n = 2, then x + y = 31 and the ones digit is 1, which is less than 5. So in this case Quantity B is greater than Quantity A.

Since in one case Quantity A is greater than Quantity B, and in the other case Quantity B is greater than Quantity A, you can conclude that the correct answer is Choice D.
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Re: n is a positive integer, x = 7n + 2, and y = 6n + 3. [#permalink] New post 14 May 2016, 22:00
x + y = 13n + 5.

if n = 10 then the unit digit will be 5 and if n=1 the unit digit will be 8

So the answer is D
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Re: n is a positive integer, x = 7n + 2, and y = 6n + 3. [#permalink] New post 24 Feb 2018, 18:56
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sandy wrote:
n is a positive integer, x = 7n + 2, and y = 6n + 3.

Quantity A
Quantity B
The ones of x + y
5


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.




Practice Questions
Question: 3
Page: 62


Substitute 1 and the statement becomes equal. Substitute 2 then B is greater than A.
Ans - D
booyah!
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Re: n is a positive integer, x = 7n + 2, and y = 6n + 3. [#permalink] New post 05 Jul 2018, 14:52
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Why did they just word this "the ones"? I had no idea what exactly it was asking for.
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Re: n is a positive integer, x = 7n + 2, and y = 6n + 3. [#permalink] New post 06 Jul 2018, 09:51
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I think you are perfectly right. The "ones" has little sense even to me.

The right wording should be "the unit digit"

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Re: n is a positive integer, x = 7n + 2, and y = 6n + 3.   [#permalink] 06 Jul 2018, 09:51
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