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

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GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4709
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 90

Kudos [?]: 1605 [0], given: 375

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If j is a multiple of 12, and k is a multiple of 21, then jk [#permalink] New post 14 Nov 2016, 15:23
Expert's post
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Question Stats:

80% (01:02) correct 20% (00:00) wrong based on 5 sessions
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

Drill 4
Question: 5
Page: 293
[Reveal] Spoiler: OA

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Sandy
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1 KUDOS received
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4709
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 90

Kudos [?]: 1605 [1] , given: 375

CAT Tests
Re: If j is a multiple of 12, and k is a multiple of 21, then jk [#permalink] New post 14 Nov 2016, 15:25
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Expert's post
Explanation

Plug in values for j and k.

Since every number is a multiple of itself, go ahead and start with j = 12 and k = 21; jk is now 252. You can use your on-screen calculator to determine that, of the answer choices, only 28 divides evenly into 252. Choice D is correct.
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Re: If j is a multiple of 12, and k is a multiple of 21, then jk   [#permalink] 14 Nov 2016, 15:25
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If j is a multiple of 12, and k is a multiple of 21, then jk

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