How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

I have feet, but no legs. Which animal Am I?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

How can you tell a raw egg from a hard-boiled egg?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

If 1+9+8=1, what is 2+8+9?

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?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

There is something which you can be arrested for attempting but not for successfully completing.

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?