If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

What has lots of eyes, but can’t see?

What has hands, but can’t clap?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

What is the next number in this series?

4,12,84,3612....

If two's company, and three's a crowd, then whats four and five ?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

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