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

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

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19 Sep 2016, 05:42
3
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Difficulty:

55% (hard)

Question Stats:

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

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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.

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

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

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

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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
Joined: 26 Jan 2016
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Re: Paul, a painter, paints only flowers or cats in his notebook. The pict  [#permalink]

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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
Joined: 18 Sep 2016
Posts: 48
Re: Paul, a painter, paints only flowers or cats in his notebook. The pict  [#permalink]

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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
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Paul, a painter, paints only flowers or cats in his notebook. The pict  [#permalink]

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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)!

$$? = y$$

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.
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Paul, a painter, paints only flowers or cats in his notebook. The pict   [#permalink] 28 Jan 2019, 06:24
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# Paul, a painter, paints only flowers or cats in his notebook. The pict

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