Forum Home > GMAT > Quantitative > Problem Solving (PS)
Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Dec 1511:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease.
Dec 1410:00 AM EST
-12:00 PM EST
Think a 100% GMAT Verbal score is out of your reach? Target Test Prep will make you think again! Our course uses techniques such as topical study and spaced repetition to maximize knowledge retention and make studying simple and fun.- Dec 14
11:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test. 
Dec 1608:00 AM PST
-11:59 PM PST
GMAT Club 12 Days of Christmas is a 4th Annual GMAT Club Winter Competition based on solving questions. This is the Winter GMAT competition on GMAT Club with an amazing opportunity to win over $40,000 worth of prizes!- Dec 17
09:00 AM PST
-10:00 AM PST
Join Manhattan Prep instructor Whitney Garner for a fun—and thorough—review of logic-based (non-math) problems, with a particular emphasis on Data Sufficiency and Two-Parts. - Dec 18
10:00 AM PST
-11:00 AM PST
Here is the essential guide to securing scholarships as an MBA student! In this video, we explore the various types of scholarships available, including need-based and merit-based options.
21 May 2017, 10:57
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
56% (01:09) correct
44%
(01:12)
wrong
based on 165
sessions
History
Date
Time
Result
Not Attempted Yet
If E is the midpoint of AD, what is the length of EB?
(1) ∠D = 60°
(2) DC = 4
Attachment:
2017-05-21_2155.png [ 6.28 KiB | Viewed 5554 times ]
21 May 2017, 11:19
Kudos
Bookmarks
Since both EB and DC are perpendicular on the same line, EB is parallel to DC.
Thus angle AEB = angle ADC (corresponding angles)
Also by mid point theorem of a triangle, since E is the mid point of AD and EB||DC,
B must be the mid point of AC and EB = DC/2
Statement 1. angle ADC = 60 , so angle AEB is also = 60
Triangle AEB is a 30-60-90 triangle. So we know the ratio of sides of this triangle.
But since none of the three sides is given, we cannot find anything. So Insufficient
Statement 2. DC = 4, so EB = DC/2 = 2 (mid point theorem)
Sufficient
Hence answer is B
Thus angle AEB = angle ADC (corresponding angles)
Also by mid point theorem of a triangle, since E is the mid point of AD and EB||DC,
B must be the mid point of AC and EB = DC/2
Statement 1. angle ADC = 60 , so angle AEB is also = 60
Triangle AEB is a 30-60-90 triangle. So we know the ratio of sides of this triangle.
But since none of the three sides is given, we cannot find anything. So Insufficient
Statement 2. DC = 4, so EB = DC/2 = 2 (mid point theorem)
Sufficient
Hence answer is B
21 May 2017, 12:12
Kudos
Bookmarks
Bunuel
If E is the midpoint of AD, what is the length of EB?
(1) ∠D = 60°
(2) DC = 4
Attachment:
2017-05-21_2155.png
I think b alone is sufficient as it provides measure of a side.
Triangles AEB and ADC are similar(Angle A is common, Angle b and c are 90 degrees, angle E and D will be equal)
AE/ED=EB/DC
1/2=EB/4
EB=2.
Please correct me if i am wrong.
