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

 It is currently 17 Dec 2018, 10:15

### 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

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

## Events & Promotions

###### Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
• ### 10 Keys to nail DS and CR questions

December 17, 2018

December 17, 2018

06:00 PM PST

07:00 PM PST

Join our live webinar and learn how to approach Data Sufficiency and Critical Reasoning problems, how to identify the best way to solve each question and what most people do wrong.
• ### R1 Admission Decisions: Estimated Decision Timelines and Chat Links for Major BSchools

December 17, 2018

December 17, 2018

10:00 PM PST

11:00 PM PST

From Dec 5th onward, American programs will start releasing R1 decisions. Chat Rooms: We have also assigned chat rooms for every school so that applicants can stay in touch and exchange information/update during decision period.

# solve

Author Message
Intern
Joined: 16 Feb 2018
Posts: 8

### Show Tags

18 Feb 2018, 07:07
Attachment:

IMG_20180218_210927.jpeg [ 23.65 KiB | Viewed 249 times ]

Sent from my HUAWEI TIT-AL00 using GMAT Club Forum mobile app
Math Expert
Joined: 02 Aug 2009
Posts: 7111

### Show Tags

19 Feb 2018, 03:42
1971 wrote:
Attachment:
IMG_20180218_210927

Sent from my HUAWEI TIT-AL00 using GMAT Club Forum mobile app

A poorly written Question..
But still the answer would be..
It's basically a circle of 10 units..
So one rotation of that point is circumference of this circle, so 2*π*10=20π
300 rotation per minute means 5 rotation in 1second..
So 15*5=75 in 15 seconds..
So the point will travel 75 rotation or 75*20π=1500π
B
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

GMAT online Tutor

Intern
Joined: 16 Feb 2018
Posts: 8

### Show Tags

19 Feb 2018, 07:28
thanks so much

Sent from my HUAWEI TIT-AL00 using GMAT Club Forum mobile app
Status: Preparing for GMAT
Joined: 25 Nov 2015
Posts: 984
Location: India
GPA: 3.64

### Show Tags

19 Feb 2018, 07:58
1971 wrote:
Attachment:
IMG_20180218_210927

Sent from my HUAWEI TIT-AL00 using GMAT Club Forum mobile app

In 1 revolution, the point moves distance = Circumference of the circle = 2πx10=20π
Fan rotates at 300 rev/min = 300/60 =5 rev/s
In 15sec, the point moves distance = 20π x 5 x 15 = 1500π

_________________

Please give kudos, if you like my post

When the going gets tough, the tough gets going...

Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 6656
GMAT 1: 760 Q51 V42
GPA: 3.82

### Show Tags

21 Feb 2018, 13:32
1971 wrote:
Attachment:
IMG_20180218_210927

Sent from my HUAWEI TIT-AL00 using GMAT Club Forum mobile app

The distance in 1 revolutions is 2π*10 = 20π.
The fan rotates 75 time in 1/4 mins, since (1/4)*300 = 75.

Thus the distnace in 1/4 mins with the rate of 300rpm is 20π*75 = 1500π

Happy Studying !!!
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only \$99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Intern
Joined: 16 Feb 2018
Posts: 8

### Show Tags

21 Feb 2018, 17:28
thanks

Sent from my HUAWEI TIT-AL00 using GMAT Club Forum mobile app
Re: solve &nbs [#permalink] 21 Feb 2018, 17:28
Display posts from previous: Sort by

# solve

Moderator: souvonik2k

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.