Difficulty Popularity

The scenario comprises of a wobbly bridge and four people. It is the night time and the people have only one torch. Without torch one may risk his life in crossing the bridge. Also we have a condition; the bridge is not quite strong and can hold only two persons together at one. The four people take different time to cross the bridge - 1 min, 2 min, 7 min and 10 min.

Since the torch is a necessity and the bride can't hold more than two persons at a time, two persons must travel at a time out of which one must return with the torch so they don't risk their life crossing in the dark.

What is the shortest time that will be required for all of them to cross the bridge?

Since the torch is a necessity and the bride can't hold more than two persons at a time, two persons must travel at a time out of which one must return with the torch so they don't risk their life crossing in the dark.

What is the shortest time that will be required for all of them to cross the bridge?

Difficulty Popularity

You are given with a cube with a three by three grid. Suppose you are standing on the back left corner of the cube and you are supposed to reach the front right of the cube. You are free to move towards the front, downwards or upwards.

How many ways are there that will take you to the end.

How many ways are there that will take you to the end.

Difficulty Popularity

There is a light bulb in a room. There are three switches outside the room and only one of them is connected with the bulb. You have been told that the bulb is not lit and you see that all the switches are off.

Now you have to tell the switch that is connected with the bulb and you are allowed to enter only once. There is no possibility of you seeing any light from outside so avoid the crazy answers. How will you tell?

Now you have to tell the switch that is connected with the bulb and you are allowed to enter only once. There is no possibility of you seeing any light from outside so avoid the crazy answers. How will you tell?

Difficulty Popularity

Alpha, Beta, Gamma and Delta are playing cards. All of them has one card which is laid down on the table along with two different colors on each side. None of the card contains same color on both of the sides. The colors visible on the table below them are red, green, red and blue respectively. All of them see the color present on the reverse sides and comments the following

Alpha: Yellow or Green

Beta: Neither Blue nor Green

Gamma: Blue or Yellow

Delta: Blue or Yellow

Consider the situation that out of them, two always lie.

Find out the colors on the cards of each person ?

Alpha: Yellow or Green

Beta: Neither Blue nor Green

Gamma: Blue or Yellow

Delta: Blue or Yellow

Consider the situation that out of them, two always lie.

Find out the colors on the cards of each person ?

Difficulty Popularity

You have ten sets of 10 coins. You are aware of exactly how much the coins weigh. You also know that all the coins in one set of ten are exactly a hundredth of an ounce off which makes the entire set of the ten coins a tenth of an ounce off. Also you are aware of the fact that all the other coins weight the correct amount. Now you are allowed to use an exceptionally precise digital weighing machine only once.

Can you identify which set of 10 coins is faulty?

Can you identify which set of 10 coins is faulty?

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