You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Why do we preferably have round manhole covers and not square ones?

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?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Move four matchsticks to the below square to form three squares?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.