In the four images below, can you find the odd one out?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

What has many keys but can’t open a single lock?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?