If eleven plus two equals one, what does nine plus five equal?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What does this Rebus Picture mean?

What does the below image rebus riddle means ?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

The more it dries, the wetter it becomes. Can you tell what it is?

If eleven plus two equals one, what does nine plus five equal?

What can you catch but never throw?

Why is the Hole below a Lock?

A man dies of old age on his 25 birthday. How is this possible?