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One milk distributor visits

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One milk distributor visits [#permalink] New post   14 Apr 2021, 06:00
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One milk distributor visits Harry's local stores in every 3 days and another milk distributor visits his local stores in every 7 days. If both milk distributors visited today, when is the next time both milk distributor will visit on the same day ??

A. \(4^{th}\) day from today

B. \(5^{th}\) day from today

C. \(10^{th}\) day from today

D. \(21^{st}\) day from today

E. Cannot be determined from the information above


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Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
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Re: One milk distributor visits [#permalink] New post   14 Apr 2021, 07:20
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One visits every 3rd day
Second visits every 7th day

Now, today they both visits Harry's store.
We need to find the next day when both visit the same day.

We will need to find LCM of 3 & 7, which is 21

So, on 21st day from today they both will visit the store.

Answer D
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Re: One milk distributor visits [#permalink] New post   04 Jan 2022, 08:30
One distributor visits every 3rd day and other every 7th day

So, they will meet on a day which is a multiple of both 3 and 7 => LCM (3,7) = 21st day

So, Answer will be D
Hope it helps!

Watch the following video to Learn the Basics of LCM and GCD

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Re: One milk distributor visits [#permalink]
04 Jan 2022, 08:30
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