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?

The centre of the third figure is empty. What digit should fit inside?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

What does this rebus riddle means ?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

I got a bee but no honey.
got an eye but am still blind.
got a sea but no water.
got a tea but no coffee.
got a why but no answer.

What Am I?

When monkey rotate the gear, which mark will be hit 1 or 2 ?