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A poplar tree was 3 feet high when it was planted on January 1, 1970.

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Bunuel
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A poplar tree was 3 feet high when it was planted on January 1, 1970. [#permalink] New post  23 May 2020, 05:39
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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.


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Siak0730
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Re: A poplar tree was 3 feet high when it was planted on January 1, 1970. [#permalink] New post  23 May 2020, 05:56
Bunuel wrote:
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.


PS21200


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
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BrentGMATPrepNow
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Re: A poplar tree was 3 feet high when it was planted on January 1, 1970. [#permalink] New post  24 May 2020, 09:39
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Bunuel wrote:
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.
DS21200

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
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NitishJain
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Re: A poplar tree was 3 feet high when it was planted on January 1, 1970. [#permalink] New post  25 May 2020, 13:07
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We need to find the year when the height was 20 feet. Given: height = 3ft on 1st Jan 1970

Statement 1: On January 1, 1973, it was 24 feet high.
We do not know the rate of growth it can be
1st Jan 1970. 3 3. 3
1st Jan 1971. 10 12. 10
1st Jan 1972. 16. 22. 20
1st Jan 1973. 24 24. 24

No unique answer.

NOT SUFFICIENT

Statement 2: It doubled its height during each year.

i.e.
1st Jan 1970. 3
1st Jan 1971. 6
1st Jan 1972. 12
1st Jan 1973. 24

it means heigh crossed 20 ft during 1972. Sufficient

B
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Re: A poplar tree was 3 feet high when it was planted on January 1, 1970. [#permalink] New post  14 Dec 2022, 04:07
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Re: A poplar tree was 3 feet high when it was planted on January 1, 1970. [#permalink]
14 Dec 2022, 04:07
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