Look at the picture and find out which square is not linked with any of the other squares.

Why is the Hole below a Lock?

Can you solve the maths in the below-given picture equation?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

What goes up but never comes down?

What has no start, end, or centre?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?