An algebra problem by Abhay Tiwari

Algebra Level pending

A person takes 1 minute to solve a particular problem on brilliant.org. A friend of the same person(say B) took double his time. Another friend(say C) took double the time B took. And so on like this, the next person takes double the time of previous person. How many person should solve the q., so that the average solving time becomes 4096 minutes for that question. Give your answer by rounding off.


The answer is 16.

Abhay Tiwari by Abhay Tiwari , 28, India

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1 solution

Abhay Tiwari
Apr 11, 2016

It is a geometric progression, so we do it accordingly .

1 Helpful 0 Interesting 0 Brilliant 0 Confused

U have skipped out 1 in line 5 of ur solution...so value of n is incorrect

Ankit Bajaj - 5 years, 2 months ago

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Ankit I knowingly skipped 1, because it would not make any difference.

Abhay Tiwari - 5 years, 2 months ago

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