No one wants to have it, but if one got it, he does not want to lose it. What is It?

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

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

What word begins and ends with an E, but has only one letter?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?