How many times in a given day, minutes and hour clock comes in a straight line ?

What's the best place to go shopping in the ocean?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?