GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 13 Dec 2019, 18:46

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

A certain clock marks every hour by striking a number of times equal

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Senior Manager
Senior Manager
avatar
G
Joined: 17 Aug 2018
Posts: 290
GMAT 1: 610 Q43 V31
GMAT 2: 640 Q45 V32
GMAT 3: 640 Q47 V31
GMAT ToolKit User Premium Member
Re: A certain clock marks every hour by striking a number of times equal  [#permalink]

Show Tags

New post 15 Jul 2019, 08:08
Perfect question to pick your favorite answer choice and move on at the exam lol.
Senior Manager
Senior Manager
User avatar
P
Status: Gathering chakra
Joined: 05 Feb 2018
Posts: 441
Premium Member
Re: A certain clock marks every hour by striking a number of times equal  [#permalink]

Show Tags

New post 13 Aug 2019, 11:43
Bunuel wrote:
A certain clock marks every hour by striking a number of times equal to the hour, and the time required for a stroke is exactly equal to the time interval between strokes. At 6:00 the time lapse between the beginning of the first stroke and the end of the last stroke is 22 seconds. At 12:00, how many seconds elapse between the beginning of the first stroke and the end of the last stroke?

(A) 72
(B) 50
(C) 48
(D) 46
(E) 44


We are given time stroke = time between strokes, the trap here is to assume they are equivalent and get messed up in calculating those numbers. However, it's stated that we are counting the "time between the first and last stroke" only; i.e. there is no interval on the last stroke.

This is a good question to draw a diagram:

x = stroke, o = interval

x-o-x-o-x-o-x-o-x-o-x
1---2---3---4---5----6


You can see there are 6 x's and only 5 o's, this means 22 secs is evenly divided by 11... 2 secs per stroke
Now, applying the same logic to 12, it would be double the number of strokes (24) minus 1 (for the cut-off at the end).

2*23 = 46, D.
Director
Director
User avatar
V
Joined: 24 Oct 2016
Posts: 586
GMAT 1: 670 Q46 V36
GMAT 2: 690 Q47 V38
Re: A certain clock marks every hour by striking a number of times equal  [#permalink]

Show Tags

New post 30 Oct 2019, 15:03
Bunuel wrote:
A certain clock marks every hour by striking a number of times equal to the hour, and the time required for a stroke is exactly equal to the time interval between strokes. At 6:00 the time lapse between the beginning of the first stroke and the end of the last stroke is 22 seconds. At 12:00, how many seconds elapse between the beginning of the first stroke and the end of the last stroke?

(A) 72
(B) 50
(C) 48
(D) 46
(E) 44


Problem Solving
Question: 110
Category: Arithmetic Operations on rational numbers
Page: 75
Difficulty: 600


The Official Guide For GMAT® Quantitative Review, 2ND Edition


At 6:00:
Total intervals = 11
Time for one interval = x
Time taken = 22
11x = 22 => x = 22/11 = 2

At 12:00
Total intervals = 23
Total time = 23*2 = 46

ANSWER: D
GMAT Club Bot
Re: A certain clock marks every hour by striking a number of times equal   [#permalink] 30 Oct 2019, 15:03

Go to page   Previous    1   2   [ 23 posts ] 

Display posts from previous: Sort by

A certain clock marks every hour by striking a number of times equal

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne