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

It is currently 19 Jun 2018, 14:40

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

A box of chocolates has 15 rows with 10 spaces for chocolates in each

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

Hide Tags

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 46167
A box of chocolates has 15 rows with 10 spaces for chocolates in each [#permalink]

Show Tags

New post 07 Jan 2018, 23:06
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

67% (01:11) correct 33% (01:27) wrong based on 18 sessions

HideShow timer Statistics

A box of chocolates has 15 rows with 10 spaces for chocolates in each row, how many chocolates are in the box?

(1) There is an average (arithmetic mean) of 6 empty spaces in the first 8 rows.
(2) There is an average (arithmetic mean) of 9 empty spaces in the last 9 rows.

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

DS Forum Moderator
avatar
P
Joined: 22 Aug 2013
Posts: 1192
Location: India
Premium Member
Re: A box of chocolates has 15 rows with 10 spaces for chocolates in each [#permalink]

Show Tags

New post 08 Jan 2018, 11:39
Bunuel wrote:
A box of chocolates has 15 rows with 10 spaces for chocolates in each row, how many chocolates are in the box?

(1) There is an average (arithmetic mean) of 6 empty spaces in the first 8 rows.
(2) There is an average (arithmetic mean) of 9 empty spaces in the last 9 rows.


So 15 rows, 10 spaces in each row. Any non-empty space is occupied by chocolate.

(1) In the first 8 rows, average empty spaces per row = 6, so total empty spaces = 6*8 = 48. So out of 80 total spaces, 48 are empty. Thus 80-48 = 32 have chocolates. But no data about other rows. Insufficient.

(2) In the last 9 rows, average empty spaces per row = 9, so total empty spaces = 9*9 = 81. So out of 90 total spaces, 81 are empty. Thus 90-81 = 9 have chocolates. But no data about other rows. Insufficient.

Combining the statements, we have first 8 rows and last 9 rows. 8+9 = 17, but there are total 15 rows only. So there is an overlap of 2 rows between first and second statements, of which we have no data per se. Until we know the number of chocolates in those 2 rows (7th, 8th from top Or 8th,9th from bottom) we cannot answer this question. Hence E answer
Re: A box of chocolates has 15 rows with 10 spaces for chocolates in each   [#permalink] 08 Jan 2018, 11:39
Display posts from previous: Sort by

A box of chocolates has 15 rows with 10 spaces for chocolates in each

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


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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®.