## Aplusclick Best Puzzles 2019

December 1, 2019 Leave a comment

These are the Best Puzzles published at www.aplusclick.org in 2019.

Math and Logic Puzzles

December 1, 2019 Leave a comment

These are the Best Puzzles published at www.aplusclick.org in 2019.

February 11, 2019 Leave a comment

According to Jack Ma:

The key feature skills of the Future are:

– Value

– Believing

– Independent thinking

– Team work

– Care of others

In the future, it is not about a competition of knowledge, it is a competition of creativity, it is a competition of imagination, it is a competition of learning.

January 2, 2019 Leave a comment

Big Ben is the nickname for the Great Bell of the clock at the north end of the Palace of Westminster in London, United Kingdom.

A pile of old coins helps to keep the clock mechanism accurate. The pennies are stacked on the pendulum of the clock and have acted as weights. Adding or taking away coins effects the pendulum’s centre of mass and the rate at which it swings. A single penny will change the clock’s speed by two fifths of one second per day.

How does the weekly time change if we add 5 pennies to the pendulum?

At twelve o’clock, twelve chimes ring from the great bell in 44 seconds. ## How long does it takes to ring the hours at 15:00 ?

August 5, 2018 Leave a comment

The picture shows a subway map. A team of inspectors verifies passengers’ tickets at a station on a line, or all lines through it if there are many lines. Then they randomly choose the next neighboring station and move there to make their inspection.

How many times higher is the probability of being inspected at station C than at station A?

Are you eager to know the answer? Try yourself before reading how Markov Chain helps to solve the problem. The answer is here.

The perfect explanation is given in the PBS Infinite Series video:

March 4, 2017 Leave a comment

*Mary has a cat, and a rat, and a hat, and a mat.*

**If the cat is on the mat, and rat is in the hat, but the hat is on the mat, where is the rat?**

This is a simple puzzle asked by Leslie Green, who collects dozens challenging puzzles. The collection of Leslie Logic and Math is presented at the website Aplusclick. It’s worth to try the challenging questions.

February 5, 2017 Leave a comment

Jim is going on a tour around the world. He has 5 tops, 4 bottoms, and 3 pairs of footwear. He wants to post a selfie everyday to show different places and his different outfits to his girl-friend Mary, who stays at home. He does not want to wear the same outfit twice. ## For how many days does he have enough clothing?

Leslie Green gives the answer : 96 days.

Can you explain why it is 96? What is logic behind?

April 23, 2016 1 Comment

This is a very famous logic problem:

*“Jack is looking at Anne, but Anne is looking at George. Jack is married, but George is not. Is a married person looking at an unmarried person?*

**A: Yes**

**B: No**

**C: Cannot be determined”**

According to the Keith E. Stanovich in Scientific American more than **80 percent** of people choose C, which is not the correct answer. The correct answer is A. Why?

This is another example of a similar problem:

*There are only two handshakes in a meeting: John shakes hands with a person, this person shakes hands with Anna. Does a man shake hands with a woman in the meeting?*