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Re: A certain clock marks every hour by striking a number of times equal [#permalink]
motion2020 wrote:
Quantity A: between 12 and 12, it's (1+11)*11/2=66
Answer is A
KarunMendiratta wrote:
A certain clock marks every hour by striking a number of times equal to the hour, and the time required for a stroke is exactly equal to the time interval between strokes.

Quantity A
Quantity B
Number of seconds elapsed between the beginning of the first stroke and the end of the last stroke when it is 12:00
45


A. Quantity A is greater
B. Quantity B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given


Kudos for the right answer and explanation
Question part of the project GRE Quant/Math Extreme Challenge Daily (2021) Edition
GRE - Math Book



But the answer is D
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Re: A certain clock marks every hour by striking a number of times equal [#permalink]
KarunMendiratta wrote:
A certain clock marks every hour by striking a number of times equal to the hour, and the time required for a stroke is exactly equal to the time interval between strokes.

Quantity A
Quantity B
Number of seconds elapsed between the beginning of the first stroke and the end of the last stroke when it is 12:00
45


A. Quantity A is greater
B. Quantity B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given

Edited OA: 1 Sep 2021



KarunMendiratta please correct me --

# of units of the duration of one stroke = a
# of units of time between 2 strokes = a (since the stem says that these 2 are equal)

So, Qty A = 12 * a * a
Now, a = 1 sec, or 2 secs or more
If a = 1, A = 12 and if a = 2, A = 48.

Answer is D.
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Re: A certain clock marks every hour by striking a number of times equal [#permalink]
1
Expert Reply
It is correct

PS: I do not thin you will have any reply from Karun. The last time he logged in was in May
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