What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

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?

What is the next number in this series?

4,12,84,3612....

What you cannot hold but it is yours?

What country can make you shiver?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.