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?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

How many triangles can you find in this given picture?

What seven-letter word has hundreds of letters in it?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

We have arranged an array of numbers below. What you have to do is use any kind of mathematical symbol you know excluding any symbol that contains a number like cube root. You can use any amount of symbols but you have to come up with a valid equation for all of them.

0 0 0 = 6
1 1 1 = 6
2 + 2 + 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

Remove two matchsticks to make the below equation correct.

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?