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If j is a multiple of 12, and k is a multiple of 21, then jk must be a

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Math Expert
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Joined: 02 Sep 2009
Posts: 52230
If j is a multiple of 12, and k is a multiple of 21, then jk must be a  [#permalink]

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New post 30 Oct 2018, 23:56
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Difficulty:

  15% (low)

Question Stats:

85% (00:55) correct 15% (01:05) wrong based on 39 sessions

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Joined: 31 Oct 2013
Posts: 951
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: If j is a multiple of 12, and k is a multiple of 21, then jk must be a  [#permalink]

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New post 31 Oct 2018, 00:13
Bunuel wrote:
If j is a multiple of 12, and k is a multiple of 21, then jk must be a multiple of which of the following?

A. 8
B. 15
C. 22
D. 28
E. 35



j = 12k

k = 21k

Lcm of 12 and 21 : 84 ...........the minimum value of jk

Option 28 is the answer.

28 * 3 = 84.
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Re: If j is a multiple of 12, and k is a multiple of 21, then jk must be a  [#permalink]

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New post 31 Oct 2018, 01:29
Bunuel wrote:
If j is a multiple of 12, and k is a multiple of 21, then jk must be a multiple of which of the following?

A. 8
B. 15
C. 22
D. 28
E. 35


j = 12a
k = 21b

\(jk = 12*21 * a * b = 2^2 * 3^2 * 7 * ab\)

The option which is a factor of 2^2 * 3^2 * 7 will be correct.
\(28 = 2^2 * 7\)

Answer (D)
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Re: If j is a multiple of 12, and k is a multiple of 21, then jk must be a &nbs [#permalink] 31 Oct 2018, 01:29
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If j is a multiple of 12, and k is a multiple of 21, then jk must be a

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