I know a nine-letter word having only one vowel.
Do you ?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

Can you count the number of triangles in the picture below?

When it is alive we sing, when it is dead we clap our hands. What is it?

In the image given, you can find several triangles. Can you count them all?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

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