You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Why Wine Glass Stem is so long?

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

What is so fragile that saying its name breaks it?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

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

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Can you move 2 matchsticks to form four equal sized squares.