When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Solve the following series:
AZ, GT, MN, __, YB

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

Where do you go to learn how to make ice cream?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

Which tank will fill first?

James bond was pushed out of an aeroplane without any parachute.
He survived, How come?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?