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

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

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?

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Paul's height is six feet, he's an assistant at a butcher's shop and wears size 9 shoes. What does he weigh?