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.

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