How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Find the missing number in the image below.

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What word begins and ends with an E, but has only one letter?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Why is the Hole below a Lock?

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

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

How can a man go eight days without sleep?