What is common among 11, 69, and 88?

Can you solve the below tricky visual equation?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

How far can you walk into the woods?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

No matter how little or how much you use me, you change me every month. What am I?

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?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

The centre of the third figure is empty. What digit should fit inside?