Latest CTS Aptitude Question SOLUTION: A secret can be told only to 2 persons in 5 minutes .the same person tells to 2 more persons and so on . How long will take to tell it to 768 persons ? a) 47.5 min b)50 min c) 500

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(#M40001500) CTS Logical Reasoning question Keep an EYE

A secret can be told only to 2 persons in 5 minutes .the same person tells to 2 more persons and so on . How long will take to tell it to 768 persons ?
a) 47.5 min b)50 min c) 500 min d)49 min

Solution

at start one person will tell to 2 persons, it will take 5 min, now that 1+2 = 3 persons will tell this to next 6 persons, then 1+2+6 = 9 persons will tell to next 18 persons, then 1+2+6+18 = 27 persons to 54 similarly 1+2+6+18+54 = 81 persons will tell this to 162 persons similarly 1+2+6+18+54+162 = 243 persons will tell this to 486 persons, upto this step total persons who have listened this secret = 2+6+18+54+162+486 = 728, and total time taken upto this step = 5*6 = 30 min, now next 5 min will be sufficient to tell this message to next 40 persons so total time taken = 35 min

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Asked In CTS Neha Jain (13 years ago)

Solved Karthick Babu Read Solution (3)

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Read Solution (3) :

Guru Prasanth  (13 years ago)

By trail n error method,I found it to be 47.5 Min..!!!

Is this solution Helpfull? Yes (24) | No (5)  

Karthick Babu  (13 years ago)

Ans is opt (b) 50 min.
1->2->4->8->16......->512->1024
2^9=512 After this definitely one person need 5 min to tell to others. So totally 10 * 5 min =50 min

Is this solution Helpfull? Yes (12) | No (6)  

Sukanta Mondal  (12 years ago)

Can u expln trail n error method??

Is this solution Helpfull? Yes (4) | No (3)  

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