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

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?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Spot what is wrong here in below Picture?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

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?