Interview Puzzles

Stack of 'must-know' interview puzzles !

Puzzle: Magic paper bin

7548 views

In an editorial department, there is a common bin where people throw their waste papers. If the number of waste papers become double every minute and it takes one hour for the basket to become full. 
After how many minutes will the basket be half filled ?
a) 30
b) 59
c) 49
d) 25

1 Vote Up   |   Post Answer   |   View Solution

By  Roshan





Roshan Roshan   5 years ago

Answer: (b)59
Reason: The paper bin amounts to double every minute.
After 1 hour (= 60 minutes) = paper bin full
After (60-1 = 59) minutes = (paper bin full)/2
Hence, after 59 minutes the paper bin is half filled.

Reply    4 Vote Up   0 Vote Up


Abhishek Chandel Abhishek Chandel   5 years ago

59 mins

Reply    0 Vote Up   0 Vote Up


Sooraj Dwivedi Sooraj Dwivedi   8 months ago

59

Reply    0 Vote Up   0 Vote Up