What is so fragile that saying its name breaks it?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

John bought a new car. He has a habit of eating ice cream from a particular ice cream shop while returning home from office. Whenever, he eats strawberry ice cream, he faces no problem. But whenever, he eats chocolate ice cream, the car starts giving problem. At first, he thinks, it is just a co-incidence but when this awkward incident happens for 3-4 times, he reports this problem to the company.

The mechanic of the company checks but finds no problem at all. The next day, when he stops by to eat chocolate ice cream, the car again starts giving problem.

Can you find the possible reason?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

What has no start, end, or centre?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

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?