Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

In which direction should the missing arrow point?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

What is the largest number you can write with just 3 digits?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

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