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02 Feb 2016, 02:06
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Difficulty:
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Question Stats:
51% (01:03) correct
49%
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How much wallpaper is needed to cover the two largest walls of a narrow room that is 9 feet high?
(1) The room is 10 feet wide.
(2) The room is 24 feet long.
(1) The room is 10 feet wide.
(2) The room is 24 feet long.
03 Feb 2016, 01:09
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Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
How much wallpaper is needed to cover the two largest walls of a narrow room that is 9 feet high?
(1) The room is 10 feet wide.
(2) The room is 24 feet long.
In the original condition, there are 4 variables(length and width of the wall, length and width of the wall paper), which should match with the number of equations. So you need 4 equations. For 1) 1 equation, for 2) 1 equation, which is likely to make E the answer.
When 1) & 2), you cannot figure out length and width of the wall paper, which is not sufficient.
Therefore, the answer is E.
-> For cases where we need 3 more equations, such as original conditions with “3 variables”, or “4 variables and 1 equation”, or “5 variables and 2 equations”, we have 1 equation each in both 1) and 2). Therefore, there is 80% chance that E is the answer (especially about 90% of 2 by 2 questions where there are more than 3 variables), while C has 15% chance. These two are the majority. In case of common mistake type 3,4, the answer may be from A, B or D but there is only 5% chance. Since E is most likely to be the answer using 1) and 2) separately according to DS definition (It saves us time). Obviously there may be cases where the answer is A, B, C or D.
How much wallpaper is needed to cover the two largest walls of a narrow room that is 9 feet high?
(1) The room is 10 feet wide.
(2) The room is 24 feet long.
In the original condition, there are 4 variables(length and width of the wall, length and width of the wall paper), which should match with the number of equations. So you need 4 equations. For 1) 1 equation, for 2) 1 equation, which is likely to make E the answer.
When 1) & 2), you cannot figure out length and width of the wall paper, which is not sufficient.
Therefore, the answer is E.
-> For cases where we need 3 more equations, such as original conditions with “3 variables”, or “4 variables and 1 equation”, or “5 variables and 2 equations”, we have 1 equation each in both 1) and 2). Therefore, there is 80% chance that E is the answer (especially about 90% of 2 by 2 questions where there are more than 3 variables), while C has 15% chance. These two are the majority. In case of common mistake type 3,4, the answer may be from A, B or D but there is only 5% chance. Since E is most likely to be the answer using 1) and 2) separately according to DS definition (It saves us time). Obviously there may be cases where the answer is A, B, C or D.
03 Feb 2016, 02:12
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Bunuel
Height of Room = 9 feet
Bigger dimension of Length and width is needed to find the area of biggest walls to find the amount of wallpaper needed to cover them
Question : What is the length of bigger dimension of length and width of room ?
Statement 1: The room is 10 feet wide.
The other dimension i.e. length is not available to find which one is bigger and what's the dimension of bigger dimension of room. Hence
NOT SUFFICIENT
Statement 2: The room is 24 feet long.
The other dimension i.e. length is not available to find which one is bigger and what's the dimension of bigger dimension of room. Hence
NOT SUFFICIENT
Combining the two statements
L= 24 and b = 10
i.e. Longer dimension is 24
Height = 9
Area of biggest wall = L*H = 24*9
Since we have area, Hence
SUFFICIENT
Answer: option C
I answered E because the question doesn't say its a rectangular room... ?
