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23 May 2020, 05:39
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
87% (00:50) correct
13%
(01:08)
wrong
based on 353
sessions
History
Date
Time
Result
Not Attempted Yet
A poplar tree was 3 feet high when it was planted on January 1, 1970. During what year did it pass the height of 20 feet?
(1) On January 1, 1973, it was 24 feet high.
(2) It doubled its height during each year.
ID: 700132
DS21200
(1) On January 1, 1973, it was 24 feet high.
(2) It doubled its height during each year.
ID: 700132
DS21200
24 May 2020, 09:39
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Bunuel
Given: A poplar tree was 3 feet high when it was planted on January 1, 1970.
Target question: During what year did it pass the height of 20 feet?
Statement 1: On January 1, 1973, it was 24 feet high.
Important: This means the tree grew 24 feet in 3 years. HOWEVER, we cannot then conclude that the tree grew 8 feet each year, since we're given no information to suggest the tree grew at a constant rate.
This means the tree's height could have passed 20 feet in 1970, 1971, or 1972
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT
Statement 2: It doubled its height during each year.
Perfect! We now know the following:
January 1, 1970: height = 3 feet
January 1, 1971: height = 6 feet
January 1, 1972: height = 12 feet
January 1, 1973: height = 24 feet
So, the tree's height passed 20 feet in 1972
Since we can answer the target question with certainty, statement 2 is SUFFICIENT
Answer: B
Cheers,
Brent
General Discussion
Siak0730
Kellogg School Moderator
Joined: 25 Aug 2015
Last visit: 16 Jul 2025
Posts: 65
Own Kudos:
Given Kudos: 81
Location: India
Schools: ISB '25 (A)
GMAT Focus 1: 655 Q85 V82 DI80 
GMAT 1: 640 Q50 V26
GMAT 2: 660 Q47 V34
GPA: 3.0
23 May 2020, 05:56
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Bunuel
statement 1: On January 1, 1973, it was 24 feet high.
no information which year it was 20 feet high, also, no additional information to compute anything.
Therefore, not sufficient or NOT A
statement 2: It doubled its height during each year.
it implies below
January 1, 1970 : height 3 feet
January 1, 1971 : height 6 feet
January 1, 1972 : height 12 feet
January 1, 1973 : height 24 feet
from above, we can conclude in 1972 it crossed 20 feet in height.
Therefore, B is answer
