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?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

What month of the year has 28 days?

What will you call your mother's brother's brother-in-law?

why number 8549176320 is one of a kind?