Timer
00:00
Answers
A
B
C
D
E
Stats
Difficulty—
If BC = BD, what is the length of BC?
(1) x = 30
(2) AD = 1
OA B
Source: Magoosh
If BC = BD, what is the length of BC?
(1) x = 30
(2) AD = 1
OA B
Source: Magoosh
BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course
Redeem
Featured Course
Target Test Prep GMAT OnDemand
Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.
- 715+ score guarantee — highest in the industry (99th percentile)
- 52 chapters · 1,500+ lessons · 4,000+ practice questions
- 400 hours of video · 1,500+ instructor-led HD smartboard lessons
- 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
- 24/7 live support + weekly Zoom office hours with GMAT instructors
- TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
- 1,200+ flashcards + AI-powered study assistant & daily calendar
- OnDemand, LiveTeach & GMAT Bootcamp formats available
- Also: GRE, SAT Math & Executive Assessment courses
- MBA Admissions Consulting now available
- 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
- 200,000+ students served
- 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★
5.0
(559 reviews)
130-pt guarantee
$0 to start
then $127/mo
If BC = BD, what is the length of BC?
If BC = BD, what is the length of BC?
(1) x = 30
(2) AD = 1
OA B
Source: Magoosh
Source: Beat The GMAT — Data Sufficiency |
GMAT/MBA Expert
-
Jay@ManhattanReview
- GMAT Instructor
- Posts: 3008
- Location: Grand Central / New York
- Thanked: 470 times
BTGmoderatorDC wrote: ↑Tue Apr 21, 2020 5:18 pmDS1.png
If BC = BD, what is the length of BC?
(1) x = 30
(2) AD = 1
OA B
Source: Magoosh
Pl. see the attached image.BTGmoderatorDC wrote: ↑Tue Apr 21, 2020 5:18 pmDS1.png
If BC = BD, what is the length of BC?
(1) x = 30
(2) AD = 1
OA B
Source: Magoosh
In ∆BCD, we have BD = BC, thus, /_BCD = /_BDC = xº
=> /_CBD = 180 – xº => /_DBA = /_2xº
Thus, ∆ABD is an isosceles triangle with /_A = /_DBA = 2xº
=> AD = BD
Now let's come to the statements.
Statement 1 alone is insufficient s we do not know the measure of any side.
Statement 2 is sufficient since AD = 1; thus, BD =1. Since we know that BD = BC, we have BC = 1. Sufficient.
The correct answer: B
Hope this helps!
-Jay
_________________
Manhattan Review Test Prep
Locations: Manhattan Review Bangalore | Free GRE Practice Test | GRE Prep Hyderabad | Kukatpally GRE Coaching | and many more...
Schedule your free consultation with an experienced GMAT Prep Advisor! Click here.
