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# GmatScore: cans of paint

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Manager
Joined: 20 Aug 2009
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GmatScore: cans of paint [#permalink]

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28 Aug 2009, 05:23
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Difficulty:

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Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 3 sessions

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George can fill Q cans of paint in 3 minutes. If there are R cans of paint in one gallon, how many gallons can George fill in 45 minutes?
a. 30R/Q
b. 15R/Q
c. 30Q/R
d. 5Q/R
e. 15Q/R

OA
[Reveal] Spoiler:
E

Please explain
Manager
Joined: 18 Jul 2009
Posts: 169
Location: India
Schools: South Asian B-schools
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Re: GmatScore: cans of paint [#permalink]

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28 Aug 2009, 05:31
his speed = Q/3 cans per min
total cans he can fill = (45 x Q/3) cans

Total gallons he can fill = (45 x Q/3) cans / ( R )cans/gallon = 15Q/R gallons..OA E
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Bhushan S.
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Intern
Joined: 28 Jun 2009
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Re: GmatScore: cans of paint [#permalink]

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28 Aug 2009, 06:39
I use this method for the "variable in answer" question type:

Pick numbers

Q=3
so cans/min = 1
R=5

so 45 mins/5gallons = 9 gallons

Now plug Q and R in for each answer choice. The answer that gives you 9 is the correct choice.

E
Manager
Joined: 14 Aug 2009
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Re: GmatScore: cans of paint [#permalink]

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28 Aug 2009, 22:24
adamv30 wrote:
I use this method for the "variable in answer" question type:

Pick numbers

Q=3
so cans/min = 1
R=5

so 45 mins/5gallons = 9 gallons

Now plug Q and R in for each answer choice. The answer that gives you 9 is the correct choice.

E

use equation is not slow and more accurate.
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Manager
Joined: 25 Aug 2009
Posts: 176
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Re: GmatScore: cans of paint [#permalink]

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29 Aug 2009, 05:21
Using equation is a more better approach here..
Re: GmatScore: cans of paint   [#permalink] 29 Aug 2009, 05:21
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# GmatScore: cans of paint

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