A number 15B is divisible by 6. Which of thse will be true about the p : GMAT Problem Solving (PS)
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# A number 15B is divisible by 6. Which of thse will be true about the p

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A number 15B is divisible by 6. Which of thse will be true about the p [#permalink]

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14 Nov 2012, 07:37
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A number 15B is divisible by 6. Which of these will be true about the positive integer B?

(A) B will be even
(B) B will be Odd
(C) B will be divisible by 6
(D) Both a & b
(E) A, B and C
[Reveal] Spoiler: OA

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Re: A number 15B is divisible by 6. Which of thse will be true about the p [#permalink]

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14 Nov 2012, 07:59
vomhorizon wrote:
A number 15B is divisible by 6. Which of thse will be true about the positive integer B?

(A) B will be even
(B) B will be Odd
(C) B will be divisible by 6
(D) Both a & b
(E) A, B and C

15B is divisible by 6
=> 3*5*B is divisible by 3*2
=> 5*B is divisible by 2
=> B has to be even.

Ans A it is.
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Re: A number 15B is divisible by 6. Which of thse will be true about the p [#permalink]

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15 Feb 2013, 03:44
vomhorizon wrote:
A number 15B is divisible by 6. Which of thse will be true about the positive integer B?

(A) B will be even
(B) B will be Odd
(C) B will be divisible by 6
(D) Both a & b
(E) A, B and C

15B/6 = integer

Since we know that prime numbers of 15 are 3 and 5, B has to have at least one 2 so that the result can be an integer.
Moreover, B has to be even since it has at least one 2.
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Re: A number 15B is divisible by 6. Which of thse will be true about the p [#permalink]

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15 Feb 2013, 06:28
I'd solve this the same way as Vips did above, but if you notice that B can be equal to 2 here, then you can also see immediately that the answer is A.
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Re: A number 15B is divisible by 6. Which of thse will be true about the p [#permalink]

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29 Dec 2016, 22:27
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A number 15B is divisible by 6. Which of thse will be true about the p [#permalink]

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05 Jan 2017, 08:04
$$\frac{15B}{6} = Integer$$

(A) B will be even : Yes
(B) B will be Odd : Eliminate
(C) B will be divisible by 6 : If B is 6 yes but If B is 8 no
(D) Both a & b : Eliminate
(E) A, B and C : Eliminate
A alone true
A
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A number 15B is divisible by 6. Which of thse will be true about the p   [#permalink] 05 Jan 2017, 08:04
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