What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

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

How many triangles are there on the puzzle below?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

There are three identical triplets sisters. Demi is the oldest of them all and she always speaks the truth. Diana is the next one who is a liar always. Drew, the youngest of them all speaks both truth and lies randomly.

On a rainy day, a family friend Victor visited them. Since there were starkly identical, he was not able to recognize them. Thus to clarify, he asked one question to each one of them.

He started with the one standing on the left and asked, 'Which sister is in the middle of you three?' She answered, 'That's Demi.'

Then, he asked the one standing in the middle, 'What is your name?' She answered, 'I am Drew.'

Finally, he asked the one standing on the right, 'Who is standing in the middle?' She answered, 'She is Diana.'

Victor was left baffled. He asked the questions three times and received different answers every time.

Can you tell who was who?

Can you find a rabbit in the given picture?

I am sure no one can have two things for dinner. what are they?

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?

How many sides does a circle have?