What is always in front of you but can’t be seen?

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

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

I don't get anymore wetter, no matter how much rain falls on me.

What do you see in the image below

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Can you count the number of triangles in the given figure?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

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.

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?