Brain Teasers
Tell The World
Mad Ade is so pleased with the "Sweaty Chef" kebab shop he decides to tell everyone about it. Mad Ade passes the information on to four people in a matter of 30 minutes.
Each of these four in turn passes the "Sweaty Chef" recommendation to four other separate people in the next 30 minutes and so on.
How long it will take for everybody in the world to get to know how Mad Ade feels about the "Sweaty Chef" kebab shop?
Assume that nobody hears it more than once and the population of the world is approximately 5.6 billion.
Each of these four in turn passes the "Sweaty Chef" recommendation to four other separate people in the next 30 minutes and so on.
How long it will take for everybody in the world to get to know how Mad Ade feels about the "Sweaty Chef" kebab shop?
Assume that nobody hears it more than once and the population of the world is approximately 5.6 billion.
Answer
All of 8 hours....you just have to do the math.This many people know after this many minutes:
5 = 30
21 = 60
85 = 90
341 = 20
1365 = 150
5461 = 180
21845 = 210
87381 = 240
349525 = 270
1398101 = 300
5592405 = 330
22369621 = 360
89478485 = 390
357913941 = 420
1431655765 = 450
5,726,623,061 = 480/60 = 8 hrs.
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