It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

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

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

500 women soldiers are arranged in an array of ten rows and fifty columns in accordance with their respective heights. Now, the tallest woman from each row is asked to move out in the front. From them, the shortest one is labelled as Alpha. They are then asked to resume their original position.

Now, the shortest woman in each column is asked to come out in front. The tallest among them is labelled as Beta.

Can you find out if Alpha will be taller or Beta?

Can you find the 09 errors in the picture below?

I am quite hot but become too cold if you remove the first two letters. What am I?

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.