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

It is currently 23 Oct 2019, 17:28

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

In a courtyard, one bell rings every 1/4 hour and another bell rings

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

Hide Tags

Find Similar Topics 
Current Student
avatar
B
Joined: 29 Dec 2016
Posts: 14
Location: United States (CA)
GMAT 1: 670 Q48 V35
GPA: 3.93
In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

Show Tags

New post 20 Feb 2017, 09:33
5
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

70% (01:58) correct 30% (01:56) wrong based on 125 sessions

HideShow timer Statistics

In a courtyard, one bell rings every 1/4 hour and another bell rings every 1/5 hour. Both bells ring together at exactly the beginning of each hour. Which of the following gives all the intervals that occur between any two rings of the bells in minutes ?

A. 6 and 9 only
B. 3, 6 and 9
C. 3, 12 and 15
D. 3, 6, 9 and 12
E. 3, 6, 10 and 12

Source: 4GMAT
Intern
Intern
avatar
B
Joined: 07 Apr 2015
Posts: 10
Re: In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

Show Tags

New post 20 Feb 2017, 09:45
The bells ring at 12 minutes and 15 minutes. So they ring at 1) 12min/15min, 2) 24min/30min 3) 36min/45min 4) 48min/60min

The intervals between the listed times are: 3, 6, 9 and 12 mins.

Answer D.

Alternatively, we should notice that the the equation is linear and any interval of the ringing bells will be a constant-- in this instance "3" So C and E can be eliminated right away.
Marshall & McDonough Moderator
User avatar
D
Joined: 13 Apr 2015
Posts: 1683
Location: India
GMAT ToolKit User
Re: In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

Show Tags

New post 20 Feb 2017, 09:57
skgmatclub2016 wrote:
In a courtyard, one bell rings every 1/4 hour and another bell rings every 1/5 hour. Both bells ring together at exactly the beginning of each hour. Which of the following gives all the intervals that occur between any two rings of the bells in minutes ?

A. 6 and 9 only
B. 3, 6 and 9
C. 3, 12 and 15
D. 3, 6, 9 and 12
E. 3, 6, 10 and 12

Source: 4GMAT


The question asks for the interval between any two rings of the bells. So, I feel D is not a fool proof answer.
Manager
Manager
User avatar
S
Status: Just redeemed Kudos for GMAT Club Test !!
Joined: 14 Sep 2013
Posts: 93
Location: Bangladesh
GMAT 1: 530 Q40 V23
GPA: 3.56
WE: Analyst (Commercial Banking)
GMAT ToolKit User
Re: In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

Show Tags

New post 21 Feb 2017, 18:02
Need to find intervals occurred between any two rings. The bells ring at 12 minutes and 15 minutes. So the intervals are 3, 6, 9 and 12 mins.
Option D wins.
_________________
______________
KUDOS please, if you like the post or if it helps :-)
"Giving kudos" is a decent way to say "Thanks"

Master with structure - Numerical comparison [source: economist.com] https://gmatclub.com/forum/master-with-structure-numerical-comparison-233657.html#p1801987
Target Test Prep Representative
User avatar
D
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8137
Location: United States (CA)
Re: In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

Show Tags

New post 16 Apr 2018, 17:13
1
skgmatclub2016 wrote:
In a courtyard, one bell rings every 1/4 hour and another bell rings every 1/5 hour. Both bells ring together at exactly the beginning of each hour. Which of the following gives all the intervals that occur between any two rings of the bells in minutes ?

A. 6 and 9 only
B. 3, 6 and 9
C. 3, 12 and 15
D. 3, 6, 9 and 12
E. 3, 6, 10 and 12


For every 4th of an hour, bell one rings on minutes 15, 30, 45, and 60.

For every 5th of an hour, bell two rings on minutes 12, 24, 36, 48, and 60.

Since 15 - 12 = 3, 30 - 24 = 6, 45 - 36 = 9 and 60 - 48 = 12, the intervals are 3, 6, 9 and 12.

Answer: D
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

Manager
Manager
avatar
S
Joined: 12 Apr 2017
Posts: 141
Location: United States
Concentration: Finance, Operations
GPA: 3.1
CAT Tests
In a courtyard, one bell rings every 1/4 hour and another bell rings  [#permalink]

Show Tags

New post 28 Nov 2018, 09:25
B1 = 1/4 H
B2 = 1/5 H
B1 & B2 at the beginning of every hour

Question = WOTF could be intervals of both

B1 = 0 ,15, 30, 45, 60/0
B2 = 0 , 12, 24, 36, 48, 60/0

0 to 12 = 12
12 to 15 = 3
15 to 24 = 9
24 to 30 = 6
30 to 36 = 6
36 to 45 = 9
45 to 48 = 3
48 to 60 = 12

leaves 3,6,9,12
GMAT Club Bot
In a courtyard, one bell rings every 1/4 hour and another bell rings   [#permalink] 28 Nov 2018, 09:25
Display posts from previous: Sort by

In a courtyard, one bell rings every 1/4 hour and another bell rings

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





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