Why do we preferably have round manhole covers and not square ones?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

How many triangles can you count in the figure given?

1. How can we put an elephant in the refrigerator?
2. How can we put a Giraffe in a refrigerator?
3. The king of the jungle invites all the animals to a party everyone comes except for one animal, which animal?
4. You come to a crocodile-infested lake, you can't go around it, you can't co under it and you can't go over it, how do you get across?

Rearrange the letters in "new door" to make one word.

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