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M70-27

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Math Expert
Joined: 02 Sep 2009
Posts: 57022

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03 Sep 2018, 06:06
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Difficulty:

45% (medium)

Question Stats:

43% (01:17) correct 57% (03:10) wrong based on 7 sessions

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The snack company Incredible Edible built a 14-meter-high statue in the shape of a lowercase “i” and filled it with peanut butter. If the dot at the top of the “i” is a cylinder with a diameter of 8 meters and a height of 6 meters, which is tangent to the cuboid that makes up the bottom of the “i”, how much peanut butter was needed to fill the statue?

A. $$216 + 96\pi$$
B. $$216 + 48\pi$$
C. $$216 + 36\pi$$
D. $$288 + 48\pi$$
E. $$288 + 96\pi$$

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03 Sep 2018, 06:06
Official Solution:

The snack company Incredible Edible built a 14-meter-high statue in the shape of a lowercase “i” and filled it with peanut butter. If the dot at the top of the “i” is a cylinder with a diameter of 8 meters and a height of 6 meters, which is tangent to the cuboid that makes up the bottom of the “i”, how much peanut butter was needed to fill the statue?

A. $$216 + 96\pi$$
B. $$216 + 48\pi$$
C. $$216 + 36\pi$$
D. $$288 + 48\pi$$
E. $$288 + 96\pi$$

We’ll go for PRECISE because all the numbers we need are in the question.

This question asks us about the volume of the statue, which is actually the sum of the volumes of separate shapes: a cylinder and a cuboid. Let’s start with the cylinder: it has a diameter of 8 meters, meaning its radius is 4 meters – so its volume is $$\pi r^2h = \pi 4^2*6 = 96\pi$$. Now let’s look at the cuboid: its height is the height of the statue minus the diameter of the dot = $$14 – 8 = 6$$. Since all its dimensions are the same, the volume of the cuboid is $$a^3 = 6^3 = 216$$. So the total volume of the dot is $$96\pi + 216$$.

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Joined: 09 Jun 2018
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08 Sep 2018, 03:07
1
The cylinder is fine. However, I did not get the cuboid part. There is no rule which says all the sides of a cuboid should be same. I thought that it would be similar to dimensions of the cylinder, meaning, 14-8= 6 height, length= diameter= 8, and width= height of cylinder= 6. There by giving ans 288+96pi
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Joined: 19 Mar 2018
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13 Sep 2018, 19:33
I think this is a high-quality question and I don't agree with the explanation. There is no reference provided to specify that all the sides of cuboid are equal.
Intern
Joined: 18 May 2018
Posts: 18
Location: India
Concentration: Marketing, Strategy
Schools: DeGroote'21 (A)
GMAT 1: 730 Q49 V40

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01 Oct 2018, 15:08
This is a poor quality question.

The statue is upright and the 'dot' is a cylinder on its side. Technically the height of the cylinder is the measurement that contributes toward the height of the statue. Here, that would be the radius/diameter of the cylinder. As a result, the cylinder has a height of 8.

The cylinder has a thickness of 6, but the question incorrectly states that the cylinder has a height of 6.
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Joined: 13 Jul 2018
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Concentration: General Management, Strategy
WE: Information Technology (Journalism and Publishing)

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20 Oct 2018, 00:56
Hi

Can someone please explain the cuboid calculation. How have all of its dimensions been taken to be 6?
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Joined: 02 Nov 2018
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03 Nov 2018, 22:08
I think this is a poor-quality question and I don't agree with the explanation. the dimensions of the cuboid cant be assumed to be equal
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Joined: 25 Jun 2018
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13 Nov 2018, 08:15
1
I think this is a high-quality question and I don't agree with the explanation. it should be 288 as l = 8 (diameter of cylinder), b = 6 and height = 6
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Joined: 17 Apr 2017
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25 Jul 2019, 07:54
skunfl2001 wrote:
I think this is a high-quality question and I don't agree with the explanation. There is no reference provided to specify that all the sides of cuboid are equal.

I agree with you. There is no reason to consider the length to be 6.
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Joined: 18 Jul 2019
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03 Aug 2019, 00:22
I think this is a high-quality question and I don't agree with the explanation. cuboid is not cube. how the volume is calculated by cube of side ie 6?
Re M70-27   [#permalink] 03 Aug 2019, 00:22
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