Rearrange the letters in "new door" to make one word.

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

What does this rebus riddle means ?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

I add 5 to 9 and get 2. The answer is correct, so what am I?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

How can you tell a raw egg from a hard-boiled egg?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

What number do you get when you multiply all of the numbers on a telephone's number pad?