Latest CTS Aptitude Question SOLUTION: A person gives a secret to two other persons in 5 minutes. How long will he take to tell the secret to 768 people?

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(#M40007373) CTS Logical Reasoning question Analytical problem Keep an EYE

A person gives a secret to two other persons in 5 minutes. How long will he take to tell the secret to 768 people?

Asked In CTS (12 years ago)

Unsolved Read Solution (6)

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Read Solution (6) :

ROHINI  (10 years ago)

5 min -2 people
10 - 4
15 - 8
20 - 16
25 - 32
30 - 64
35 - 128
40 - 256
45 - 512
47.5 - 768 people
hence, ans is 47.5 minutes....

Is this solution Helpfull? Yes (8) | No (13)  

Manish  (8 years ago)

In 1st 5 min -->> 3 ppl (1+2)
in nxt 5 min these ppl will tel 6 other ppl.
so aftr 10 min total nmbr of ppl 3+6=9.
nw these 9 ppl nw tell secert to 18 other ppl.
so aftr 15 min total; nmbe of ppl 9+18=27.
so guys evry 5 min the nmbr of ppl gets tripled.
5min--> 3
10 min--> 9
15--> 27
20-->81
25 min--> 243
30 min-->729
35-->729*3
the required value
so 35 min will be sufficient.

Is this solution Helpfull? Yes (5) | No   

pulkit sharma  (9 years ago)

5 min -2 people
10 - 6
15 - 12
20 - 24
25 - 48
30 - 96
35 - 192
40 - 384
45 - 768 people
hence, ans is 45 minutes....

Is this solution Helpfull? Yes (2) | No (4)  

shailendra goyal  (9 years ago)

5 min -2 people
10 - 4
15 - 8
20 - 16
25 - 32
30 - 64
35 - 128
40 - 256
45 - 512
47.5 - 768 people
hence, ans is 47.5 minutes....

Is this solution Helpfull? Yes (1) | No (1)  

niranjan  (8 years ago)

5 min -2 people
10 - 4
15 - 8
20 - 16
25 - 32
30 - 64
35 - 128
40 - 256
45 - 512
47.5 - 768 people
hence, ans is 47.5 minutes....

Is this solution Helpfull? Yes (1) | No   

akshay  (8 years ago)

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

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