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

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Whats the next number in the below number sequence pattern.

Count the Triangle in the figure given below:

Replace the question mark with the correct number in below Picture:

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

As shown in the picture below, we can see a boy hanging on the tree branch to save his life. There are various ways in which he can die like1. A snake hanging toward the right waiting to bite the boy.2. A roaring Lion near the tree.3. Two crocodiles are ready to attack if the boy reaches near water. The tree is chopped to some extent, so can fall as if he moves a lot. Can you give this boy an escape plan?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?