How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

What does Alexander the Great and Winnie the Pooh have in common?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?