A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

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

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

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

What does this mathematical rebus means ?