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M70-04

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M70-04  [#permalink]

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New post 03 Sep 2018, 01:14
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

67% (00:13) correct 33% (00:34) wrong based on 3 sessions

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Re M70-04  [#permalink]

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New post 03 Sep 2018, 01:14
Official Solution:


We’ll go for LOGICAL since logic is the first option in Data Sufficiency.

(1) We know the size of ∠EDC… But what does that tell us about ∠ABE? More information is necessary! (A) and (D) are eliminated.

(2) Knowing that AB and CD are parallel doesn’t help us determine the value of ∠ABE without any information about the angles. (B) is eliminated.

When combining (1) and (2) we can see that ∠ABE = ∠EDC, as both are obtuse (‘large’) angles between parallel lines. So if ∠EDC = 30, we can tell the value of ∠ABE. (E) is eliminated!

Remember, what appears obtuse in data sufficiency figures, may not actually be obtuse. The figures are not drawn to scale.


Answer: C
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Re: M70-04  [#permalink]

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New post 04 Sep 2018, 06:23
1
Bunuel wrote:
Official Solution:


We’ll go for LOGICAL since logic is the first option in Data Sufficiency.

(1) We know the size of ∠ECD… But what does that tell us about ∠ABE? More information is necessary! (A) and (D) are eliminated.

(2) Knowing that AB and CD are parallel doesn’t help us determine the value of ∠ECD without any information about the angles. (B) is eliminated.

When combining (1) and (2) we can see that ∠ABE = ∠EDC, as both are obtuse (‘large’) angles between parallel lines. So if ∠EDC = 30, we can tell the value of ∠ABE. (E) is eliminated!

Remember, what appears obtuse in data sufficiency figures, may not actually be obtuse. The figures are not drawn to scale.


Answer: C


Hi Bunuel

We're given ∠ECD = 30 in statement 1 not ∠EDC so I think the answer should be E or statement 1 should be updated to say ∠EDC
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Re: M70-04  [#permalink]

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New post 04 Sep 2018, 06:54
rajudantuluri wrote:
Bunuel wrote:
Official Solution:


We’ll go for LOGICAL since logic is the first option in Data Sufficiency.

(1) We know the size of ∠ECD… But what does that tell us about ∠ABE? More information is necessary! (A) and (D) are eliminated.

(2) Knowing that AB and CD are parallel doesn’t help us determine the value of ∠ECD without any information about the angles. (B) is eliminated.

When combining (1) and (2) we can see that ∠ABE = ∠EDC, as both are obtuse (‘large’) angles between parallel lines. So if ∠EDC = 30, we can tell the value of ∠ABE. (E) is eliminated!

Remember, what appears obtuse in data sufficiency figures, may not actually be obtuse. The figures are not drawn to scale.


Answer: C


Hi Bunuel

We're given ∠ECD = 30 in statement 1 not ∠EDC so I think the answer should be E or statement 1 should be updated to say ∠EDC


Edited the typo. Thank you for noticing.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: M70-04 &nbs [#permalink] 04 Sep 2018, 06:54
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