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

It is currently 23 Oct 2019, 20:29

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

Paul, a painter, paints only flowers or cats in his notebook. The pict

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58464
Paul, a painter, paints only flowers or cats in his notebook. The pict  [#permalink]

Show Tags

New post 19 Sep 2016, 05:42
3
9
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

64% (02:34) correct 36% (02:23) wrong based on 145 sessions

HideShow timer Statistics

Paul, a painter, paints only flowers or cats in his notebook. The pictures are drawn in either regular pencil or in charcoal (but not in both.) The total number of pictures in Paul's notebook is 39 greater than the number of cat pictures painted in pencil. How many flower pictures drawn in charcoal are there in the notebook?

(1) There are 7 flower pictures drawn in pencil in the notebook.

(2) There are 11 cat pictures drawn in charcoal in the notebook.

_________________
Manager
Manager
avatar
B
Joined: 03 Jul 2016
Posts: 68
Re: Paul, a painter, paints only flowers or cats in his notebook. The pict  [#permalink]

Show Tags

New post 19 Sep 2016, 06:27
1
Must be C.

No. of pictures of flowers drawn in charcoal = 32-11 = 21.
Manager
Manager
avatar
B
Joined: 07 May 2015
Posts: 174
Location: India
GMAT 1: 660 Q48 V31
GPA: 3
GMAT ToolKit User
Re: Paul, a painter, paints only flowers or cats in his notebook. The pict  [#permalink]

Show Tags

New post 26 Sep 2016, 11:11
1
Let c be the number of cat pictures drawn with pencil. Thus total pictures = c+39
Let x be the number of flower pictures drawn with charcoal.

St 1: 7 flower pictures in pencil - Insufficient
St2: 11 cat pictures in Charcoal - Insuffcient

St 1 + St 2:

total pictures = FP+FC+CaP+CaC
c+39 = 7+x+c+11
x = 21

Ans c
Current Student
avatar
B
Joined: 26 Jan 2016
Posts: 98
Location: United States
GPA: 3.37
Re: Paul, a painter, paints only flowers or cats in his notebook. The pict  [#permalink]

Show Tags

New post 26 Sep 2016, 11:45
1
There are four types of pictures CC CP FC FP

We know CC+CP+FC+FP=39+CP
CC+FC+FP=39
1. FP=7 insuff
2. CC=11 insuff
1 &2

7+11+FC=39
FC=20
C
Intern
Intern
avatar
Joined: 18 Sep 2016
Posts: 48
Re: Paul, a painter, paints only flowers or cats in his notebook. The pict  [#permalink]

Show Tags

New post 26 Sep 2016, 12:21
1
Bunuel wrote:
Paul, a painter, paints only flowers or cats in his notebook. The pictures are drawn in either regular pencil or in charcoal (but not in both.) The total number of pictures in Paul's notebook is 39 greater than the number of cat pictures painted in pencil. How many flower pictures drawn in charcoal are there in the notebook?

(1) There are 7 flower pictures drawn in pencil in the notebook.

(2) There are 11 cat pictures drawn in charcoal in the notebook.



the question gives us an equation like \(a+b+c+d=39+b\)
so it becomes an equation with 3 variables =====> \(a+c+d=39\)

1) alone gives the value of 1 vaiable =====> still impossible find an unique solution (2 variables left)

2) alone gives the values of 1 other variable=====> still impossible find an unique solution (2 variables left)

the two conditions together give 2 the value of two variable, so we can find a solution to the equation

answer C
_________________
Please press Kudos if you like my post
GMATH Teacher
User avatar
P
Status: GMATH founder
Joined: 12 Oct 2010
Posts: 935
Paul, a painter, paints only flowers or cats in his notebook. The pict  [#permalink]

Show Tags

New post 28 Jan 2019, 06:24
Bunuel wrote:
Paul, a painter, paints only flowers or cats in his notebook. Each picture has flowers or cats (but not both) and is drawn in either regular pencil or in charcoal (but not in both). The total number of pictures in Paul's notebook is 39 greater than the number of cat pictures painted in pencil. How many flower pictures drawn in charcoal are there in the notebook?

1) There are 7 flower pictures drawn in pencil in the notebook.
2) There are 11 cat pictures drawn in charcoal in the notebook.

Excellent opportunity for the grid (a.k.a table, double matrix, you-name-it)!

Image

\(? = y\)

Following the diagram shown, it is evident that each statement alone has a trivial bifurcation (hence it is insufficient).

\(\left( {1 + 2} \right)\,\,\,\,\left( {7 + x} \right) + \left( {y + 11} \right) = x + 39\,\,\,\,\,\, \Rightarrow \,\,\,\,\,\,y\,\,{\text{unique}}\,\,\,\,\,\, \Rightarrow \,\,\,\,\,\,{\text{SUFF}}.\)


We follow the notations and rationale taught in the GMATH method.

Regards,
Fabio.
_________________
Fabio Skilnik :: GMATH method creator (Math for the GMAT)
Our high-level "quant" preparation starts here: https://gmath.net
GMAT Club Bot
Paul, a painter, paints only flowers or cats in his notebook. The pict   [#permalink] 28 Jan 2019, 06:24
Display posts from previous: Sort by

Paul, a painter, paints only flowers or cats in his notebook. The pict

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





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