How is the moon similar to a dollar?

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

What does this Rebus Picture mean?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Solve the puzzle by telling what does below picture means.

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

What Adam and Eve do not have but the rest of the people have?

A research team went to a village somewhere between the jungles of Africa. Luckily for them, they reached the day when quite an interesting custom was to be performed. The custom was performed once a year as they confirmed and was performed in order to collect the taxes from every male of the region.

The taxes were to be paid in the form of grains. Everyone must pay pounds of grain equaling his respective age. This means a 20-year-old will have to pay 20 pounds of grain and a 30-year-old will pay 30 pounds of grain and so on.

The chief who collects the tax has 7 weights and a large 2-pan scale to weigh. But there is another custom that the chief can weigh only three of the seven weights.

Can you find out the weights of the seven weights? Also, what is the maximum age of the man that can be weighed for the payment of taxes?

Can you spot the hidden girl in the picture below?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H