Can you place six X (crosses) in below board without making three in a row in any way ?

81 x 9 = 801. What must you do to make the this equation true?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

Can you count the number of matches in the picture below ?

How many letters are in the alphabet?

What goes up but never comes down?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?