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

 It is currently 22 Jul 2018, 22:51

### 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

# CHESS

Author Message
Intern
Joined: 21 Jan 2017
Posts: 10

### Show Tags

26 Jan 2017, 05:39
Find the no of non congruent rectangles on a chess board
A 28
B 36
C 42
D 54

Sent from my Lenovo A6020a46 using GMAT Club Forum mobile app
Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 5876
GMAT 1: 760 Q51 V42
GPA: 3.82

### Show Tags

01 Feb 2017, 17:30
Harshit401 wrote:
Find the no of non congruent rectangles on a chess board
A 28
B 36
C 42
D 54

Sent from my Lenovo A6020a46 using GMAT Club Forum mobile app

Hi Harshit401,

_ _ _ _ _ _ _ _ 1
|_|_|_|_|_|_|_|_| 2
|_|_|_|_|_|_|_|_| 3
|_|_|_|_|_|_|_|_| 4
|_|_|_|_|_|_|_|_| 5
|_|_|_|_|_|_|_|_| 6
|_|_|_|_|_|_|_|_| 7
|_|_|_|_|_|_|_|_| 8
|_|_|_|_|_|_|_|_| 9

On a chess board, we have following rectangles.
1x1, 1x2, 1x3, ... , 1x8
2x2, 2x3, ,,, , 2x8,
3x3, ..., 3x8
...
7x7, 7x8
8x8

Hence there 8 + 7 + ... + 2 + 1 = 36 rectangles.

Happy Studying!
Math Revolution
_________________

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"

SVP
Joined: 12 Dec 2016
Posts: 1868
Location: United States
GMAT 1: 700 Q49 V33
GPA: 3.64

### Show Tags

14 Apr 2017, 18:13
what? 1x1 and 2x2, .... are squares, not rectangles, somehow, i find this post something weird, it is not gmat problem!
Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 5876
GMAT 1: 760 Q51 V42
GPA: 3.82

### Show Tags

17 Apr 2017, 20:30
1
chesstitans wrote:
what? 1x1 and 2x2, .... are squares, not rectangles, somehow, i find this post something weird, it is not gmat problem!

Squares are also rectangles, actually.
_________________

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"

SVP
Joined: 12 Dec 2016
Posts: 1868
Location: United States
GMAT 1: 700 Q49 V33
GPA: 3.64

### Show Tags

18 Apr 2017, 16:40
MathRevolution wrote:
chesstitans wrote:
what? 1x1 and 2x2, .... are squares, not rectangles, somehow, i find this post something weird, it is not gmat problem!

Squares are also rectangles, actually.

so, if this question appears on the real gmat, how can i intepret it? I talk about square and rectangle
Re: CHESS &nbs [#permalink] 18 Apr 2017, 16:40
Display posts from previous: Sort by

# Events & Promotions

 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®.