PuzzlersWorld.com

n bulbs in a circle puzzle

by 7 Comments

There are n bulbs in a circle, each bulb has one switch associated with it, on operating the switch, it toggles the state of the corresponding bulb as well as two bulbs adjacent to that one. Given all bulbs are in off state initially, give a plan to turn all bulbs on finally.

Note: n >= 1.
[Read more…]

Guess the car number

by 8 Comments

There is a 4 digit card number,
4th digit is double of 1st digit,
2nd n 3rd digits are same,
And last digits together are double of first two digits
Can you guess the car number?


Check your answer:-
Tried enough already?
Click here to see Explanation
lets assume first digit is x, then the 4th digit will be 2x.
also assume 2nd and 3rd digits are y.
then from => last two digits are double of first two digits, we can say
y(2x) = 2*(xy)

We can rewrite is as 10y + 2x = 20x + 2 y
8y = 18x
4y = 9x; => y/x = 9/4
as x and y are integers y => 9, x => 4

thus the car number is 4998

Complete these killer shayari’s

by Leave a Comment

These shayari’s are completed in a interesting way by matching the rhyme, you can check one of the version for each shayari and there can be many more such interesting completion, Lets see if you can complete these in more funnier way, put your shayarana mind on and share your shayari with everyone 🙂

Example:-
Blood donate karne se pehle hamesha uska group janchna, Blood donate karne se pehle hamesha uska group janchna,
Completion: BASANTI in kutton ke samne mat nachna.
[Read more…]

13 caves and a thief

by 10 Comments

Find Minimum number of days to guarantee to catch the thief

13 caves and a thief puzzle

13 caves and a thief puzzle

There are 13 caves arranged in a circle. There is a thief hiding in one of the caves. Each day the the thief can move to any one of of the caves that is adjacent to the cave in which he was staying the previous day. And each day, you are allowed to enter any two caves of your choice.

What is the minimum number of days to guarantee in which you can catch the thief?

Note:

  1. Thief may or may not move to adjacent cave.
  2. You can check any two caves, not necessarily be adjacent.
  3. If thief and you exchange your caves, you will surely cross at some point, and you can catch the thief immediately.

[Read more…]

Social

privacy policy