Difficulty ★★★★☆ Popularity ★★★★★

Four people need to cross a dark river at night.They have only one torch and the river is too risky to cross without the torch. if all people cross simultaneous then torch light wont be sufficient.Speed of each person of crossing the river is different.cross time for each person is 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the river ?

Difficulty ★★★★☆ Popularity ★★★★★

Two old friends, Jack and Bill, meet after a long time.

Three kids

Jack: Hey, how are you man?

Bill: Not bad, got married and I have three kids now.

Jack: That"s awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don"t know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh now I get it.

How old are Bill"s kids?

Difficulty ★★★★☆ Popularity ★★★★☆

Tarun Asthaniya is found dead in his office at his desk. The police have narrowed the suspects down to three people: Mrs. Harish Kumar, Taruns's wife Himanshi Asthaniya and his business partner Mr. Jason Negi . All three visited Tarun on the day of his murder, but all three provide the police with stories of explanation as to the reason for their visit. Police found Mr. tarun with his wrist watch still on his right arm, a torn up picture of his wife laying on the floor beside the trash can, and an ink pen in his right hand. On the desk, the police found a name plate, a telephone that was off the hook, and a personal calendar turned to the July 5th page with 7B91011 written on it. After examining this evidence, the police knew their suspect. Who was it ?

Difficulty ★★★★☆ Popularity ★★★★★

2+3=8,

3+7=27,

4+5=32,

5+8=60,

6+7=72,

7+8=??

Solve it?

Difficulty ★★★★★ Popularity ★★★★★

You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other.

The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more.

Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light.

Difficulty ★★★★★ Popularity ★★★★★

Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 miles

AMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?

Difficulty ★★★★☆ Popularity ★★★★★

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its color and put it back into the box, without seeing the color of the other ball.

How many such operations are necessary to correctly label the boxes?

Difficulty ★★★★★ Popularity ★★★★★

You have two buckets of 11liter and 6liter.

How can you measure exactly 8liter ?

Difficulty ★★★★☆ Popularity ★★★★★

In the kingdom of skull, King Norse did not allow any citizen to visit the world outside. Also only a person with a proper paperwork was allowed to enter or he was sent back. A wooden bridge was what connected the kingdom to the world. The king had appointed a sharpshooter who would check every five minutes on the bridge to check. After checking, he would go back to his hut and return exactly after five minutes again. The bridge took 9 minutes to cross.

A merchant was able to escape the kingdom without harming the shooter.

How ?

Difficulty ★★★★★ Popularity ★★★★☆

Sherlock, A detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:

710 57735 34 5508 51 7718

Currently there are 3 suspects: Bill, John, and Todd. Can you break the detective's code and find the criminal's name?