I am white when I am dirty, and black when I am clean. What am I?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

When we see 2 but call 10?

Find the 8 in the below-given Image.

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

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

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

How could a baby fall out of a twenty-story building onto the ground and live?