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JusTLucK04
GMAT 1: 730 Q51 V38
Posts: 272
Updated on: 26 Apr 2014, 00:19
Originally posted by JusTLucK04 on 25 Apr 2014, 01:30.
Last edited by JusTLucK04 on 26 Apr 2014, 00:19, edited 5 times in total.
Last edited by JusTLucK04 on 26 Apr 2014, 00:19, edited 5 times in total.
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
57% (01:40) correct
43%
(01:56)
wrong
based on 208
sessions
History
Date
Time
Result
Not Attempted Yet
Find the ratio of areas of the triangle ADB and ABC. If BD:DC = 3:5
A. 3:5
B. 9:25
C. 3:8
D. 5:9
E. 9:16
Kudos If you liked the Question
A. 3:5
B. 9:25
C. 3:8
D. 5:9
E. 9:16
Kudos If you liked the Question
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Untitled.png [ 3.55 KiB | Viewed 7888 times ]
06 May 2014, 09:22
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JusTLucK04
Find the ratio of areas of the triangle ADB and ABC. If BD:DC = 3:5
A. 3:5
B. 9:25
C. 3:8
D. 5:9
E. 9:16
Kudos If you liked the Question
BD:DC = 3:5 --> BD:(BD+DC) = 3:(3+5) --> BD:BC = 3:8.
The area of triangle ADB = 1/2*(height from A to DB)*(DB).
The area of triangle ABC = 1/2*(height from A to BC)*(BC).
Notice that (height from A to DB) = (height from A to BC).
Therefore the ration of the areas of ADB and ABC = DB:BC = 3:8.
Answer: C.
06 May 2014, 12:03
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Bookmarks
Hi Bunuel,
Excuse me if i do not have clear concept in Geometry.
So I do not understand how below statement is true.
(height from A to DB) = (height from A to BC).
Thanks for your help.
Find the ratio of areas of the triangle ADB and ABC. If BD:DC = 3:5
A. 3:5
B. 9:25
C. 3:8
D. 5:9
E. 9:16
Kudos If you liked the Question
BD:DC = 3:5 --> BD:(BD+DC) = 3:(3+5) --> BD:BC = 3:8.
The area of triangle ADB = 1/2*(height from A to DB)*(DB).
The area of triangle ABC = 1/2*(height from A to BC)*(BC).
Notice that (height from A to DB) = (height from A to BC).
Therefore the ration of the areas of ADB and ABC = DB:BC = 3:8.
Answer: C.
Excuse me if i do not have clear concept in Geometry.
So I do not understand how below statement is true.
(height from A to DB) = (height from A to BC).
Thanks for your help.
Bunuel
JusTLucK04
Find the ratio of areas of the triangle ADB and ABC. If BD:DC = 3:5
A. 3:5
B. 9:25
C. 3:8
D. 5:9
E. 9:16
Kudos If you liked the Question
BD:DC = 3:5 --> BD:(BD+DC) = 3:(3+5) --> BD:BC = 3:8.
The area of triangle ADB = 1/2*(height from A to DB)*(DB).
The area of triangle ABC = 1/2*(height from A to BC)*(BC).
Notice that (height from A to DB) = (height from A to BC).
Therefore the ration of the areas of ADB and ABC = DB:BC = 3:8.
Answer: C.
