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# A project requires a rectangular sheet of cardboard satisfyi

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GRE Instructor
Joined: 10 Apr 2015
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A project requires a rectangular sheet of cardboard satisfyi [#permalink]  30 Jan 2019, 09:28
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Question Stats:

40% (00:00) correct 60% (03:26) wrong based on 5 sessions
A project requires a rectangular sheet of cardboard satisfying the following requirement: When the sheet is cut into identical rectangular halves, each of the resulting rectangles has the same ratio of length to width as the original sheet. Which of the following sheets comes closest to satisfying the requirement?

(A) A sheet measuring 7 inches by 10 inches
(B) A sheet measuring 8 inches by 14 inches
(C) A sheet measuring 10 inches by 13 inches
(D) A sheet measuring 3 feet by 5 feet
(E) A sheet measuring 5 feet by 8 feet
[Reveal] Spoiler: OA

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Brent Hanneson – Creator of greenlighttestprep.com

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Re: A project requires a rectangular sheet of cardboard satisfyi [#permalink]  30 Jan 2019, 20:31
Expert's post
GreenlightTestPrep wrote:
A project requires a rectangular sheet of cardboard satisfying the following requirement: When the sheet is cut into identical rectangular halves, each of the resulting rectangles has the same ratio of length to width as the original sheet. Which of the following sheets comes closest to satisfying the requirement?

(A) A sheet measuring 7 inches by 10 inches
(B) A sheet measuring 8 inches by 14 inches
(C) A sheet measuring 10 inches by 13 inches
(D) A sheet measuring 3 feet by 5 feet
(E) A sheet measuring 5 feet by 8 feet

So, when you half a rectangle, one side will get halved and other will remain the same.
Thus the ratio of B:L should be same as L/2:B or L:2B..
This means B:L=L:2B or $$L^2=2B^2$$..
Let us check the options with this.

(A) A sheet measuring 7 inches by 10 inches
B=7 and L=10, so $$L^2=2B^2...10^2=2*7^2....100=98$$..YES almost equal

(B) A sheet measuring 8 inches by 14 inches
B=8 and L=14, so $$L^2=2B^2...14^2=2*8^2....196=128$$..NO

(C) A sheet measuring 10 inches by 13 inches
B=10 and L=13, so $$L^2=2B^2...13^2=2*10^2....169=200$$..NO

(D) A sheet measuring 3 feet by 5 feet
B=3 and L=5, so $$L^2=2B^2...5^2=2*3^2....25=18$$..NO

(E) A sheet measuring 5 feet by 8 feet
B=5 and L=8, so $$L^2=2B^2...8^2=2*5^2....64=50$$..NO

A
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Some useful Theory.
1. Arithmetic and Geometric progressions : https://greprepclub.com/forum/progressions-arithmetic-geometric-and-harmonic-11574.html#p27048
2. Effect of Arithmetic Operations on fraction : https://greprepclub.com/forum/effects-of-arithmetic-operations-on-fractions-11573.html?sid=d570445335a783891cd4d48a17db9825
3. Remainders : https://greprepclub.com/forum/remainders-what-you-should-know-11524.html
4. Number properties : https://greprepclub.com/forum/number-property-all-you-require-11518.html
5. Absolute Modulus and Inequalities : https://greprepclub.com/forum/absolute-modulus-a-better-understanding-11281.html

GRE Instructor
Joined: 10 Apr 2015
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Kudos [?]: 1570 [1] , given: 8

Re: A project requires a rectangular sheet of cardboard satisfyi [#permalink]  31 Jan 2019, 10:46
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Expert's post
GreenlightTestPrep wrote:
A project requires a rectangular sheet of cardboard satisfying the following requirement: When the sheet is cut into identical rectangular halves, each of the resulting rectangles has the same ratio of length to width as the original sheet. Which of the following sheets comes closest to satisfying the requirement?

(A) A sheet measuring 7 inches by 10 inches
(B) A sheet measuring 8 inches by 14 inches
(C) A sheet measuring 10 inches by 13 inches
(D) A sheet measuring 3 feet by 5 feet
(E) A sheet measuring 5 feet by 8 feet

Here's an algebraic solution:

Let x be length of the LONG side of the original rectangle
Let y be length of the SHORT side of the original rectangle
Then cut the rectangle into two pieces

We want the resulting rectangles to have the same ratio of length to width as the original sheet.
In other words, we want x/y = y/(x/2)
Cross multiply to get: x²/2 = y²
Multiply both sides by 2 to get: x² = 2y²
Divide both sides by y² to get: x²/y² = 2
Take square root of both sides to get: x/y = √2

IMPORTANT: For the GRE, it's often useful to know the following APPROXIMATIONS: √2 ≈ 1.4, √3 ≈ 1.7, √5 ≈ 2.2

So, we know that x/y ≈ 1.4
In other words, the ratio (LONG side)/(SHORT side) ≈ 1.4

Now check the answer choices:

(A) 10/7 = 1 3/7 ≈ 1.4 LOOKS GOOD!
(B) 14/8 = 1 6/8 = 1.75 ELIMINATE
(C) 13/10 = 1.3 ELIMINATE
(D) 5/3 = 1 2/3 ≈ 1.66 ELIMINATE
(E) 8/5 = 1.6 ELIMINATE

Cheers,
Brent
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Brent Hanneson – Creator of greenlighttestprep.com

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Re: A project requires a rectangular sheet of cardboard satisfyi   [#permalink] 31 Jan 2019, 10:46
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