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

What always comes into a house through the keyhole?

Which tank will fill first?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

What is the fastest way to double your money?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What part of the chicken has the most feathers?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

Can you write down eight eights so that they add up to one thousand?