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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1053
GPA: 3.39
A paint that is sold only in gallon containers covers 200 square feet
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20 Nov 2021, 01:11
20 Nov 2021, 01:11
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Question Stats:
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A paint that is sold only in gallon containers covers 200 square feet per gallon of paint. How many gallons of the paint must be purchased to cover the walls of an auditorium that is 40 feet long, 25 feet wide, and 12 feet high if the areas of the windows and doors are ignored?
A. 4
B. 8
C. 16
D. 32
E. 60
A. 4
B. 8
C. 16
D. 32
E. 60
Re: A paint that is sold only in gallon containers covers 200 square feet
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20 Nov 2021, 02:25
20 Nov 2021, 02:25
1
\(l = 40, b = 24, h = 12\)
Lateral Surface area of Auditorium(which is a cuboid) = \(2(lb + bh) = 2(40*12 + 24*12) = \textbf{1560}\) square feet
1 gallon of paint can cover 200 square feet, then to cover 1560 square feet of wall, we need \(\frac{1560}{200} = 7.8 ≈ \textbf{8}\) gallons of paint.
Hence, Answer is B
Note: There is a bit ambiguity in the problem statement, since the question doesn't mention inner or outer side of wall which is something usually mentioned in such type of question.
Lateral Surface area of Auditorium(which is a cuboid) = \(2(lb + bh) = 2(40*12 + 24*12) = \textbf{1560}\) square feet
1 gallon of paint can cover 200 square feet, then to cover 1560 square feet of wall, we need \(\frac{1560}{200} = 7.8 ≈ \textbf{8}\) gallons of paint.
Hence, Answer is B
Note: There is a bit ambiguity in the problem statement, since the question doesn't mention inner or outer side of wall which is something usually mentioned in such type of question.
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: A paint that is sold only in gallon containers covers 200 square feet
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20 Nov 2021, 06:09
20 Nov 2021, 06:09
1
GeminiHeat wrote:
A paint that is sold only in gallon containers covers 200 square feet per gallon of paint. How many gallons of the paint must be purchased to cover the walls of an auditorium that is 40 feet long, 25 feet wide, and 12 feet high if the areas of the windows and doors are ignored?
A. 4
B. 8
C. 16
D. 32
E. 60
A. 4
B. 8
C. 16
D. 32
E. 60
Here's an idea of what the auditorium looks like:
So the total surface area to be painted = (12)(25) + (12)(25) + (12)(40) + (12)(40)
= 300 + 300 + 480 + 480
= 1560 square feet
Given: 1 gallon of paint covers 200 square feet
1560/200 = 7.something
So, 7.something gallons of paint are needed.
This means we must purchase 8 gallons of paint
Answer: B
Cheers,
Brent
