A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

What is the fastest way to double your money?

What does this rebus photo means?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Find the next number in the sequence

1, 2, 6, 21, 88, __?