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29 Jul 2023, 10:53
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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58% (02:27) correct
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The dimensions of rectangular cake are 11 inches x 7 inches x 6 inches.. The cake is to be wrapped in a sheet of aluminum foil so that the entire surface of the cake is covered. If the aluminum foil must remain in one untorn sheet, which of the following could be the dimensions of the sheet of aluminum foil?
A. 22 inches × 27 inches
B. 24 inches × 26 inches
C. 25 inches × 25 inches
D. 32 inches × 20 inches
E. 36 inches × 16 inches
A. 22 inches × 27 inches
B. 24 inches × 26 inches
C. 25 inches × 25 inches
D. 32 inches × 20 inches
E. 36 inches × 16 inches
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29 Jul 2023, 13:22
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pintukr
This question becomes relatively simple once we visualize how the sheet wraps around the cake.
Note, the dimension of the sheet in each option is different, i.e. no two options share the same value of length or breadth. We can use this fact to our advantage.
Let's focus on how the sheet wraps around the cake.
Imagine folding the sheet starting from point D → moving to point A → moving to point B → moving to point C → moving to point D.
Length traversed
= D to A → A to B → B to C → C to D = AD + AB + BC + CD
= 6 + 7 + 6 + 7 = 14 +12 = 26
Hence, one dimension of the sheet must be 26 inches.
From the available options, only option B has one of the sides of the sheet = 26 inches.
Option B
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07 Aug 2023, 08:02
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gmatophobia
gmatophobia
Can you explain why are we not taking out surface area of the cuboid (2(lb+bh+hl)) and then checking the area of the sheet that will be required to cover the cake?
This is the link for a similar question in which the question has been solved using the surface area approach - https://gmatclub.com/forum/the-figure-a ... 23592.html
Bunuel
