Can you solve this picture maths equation?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

John was drowned by he was not wet. How?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

You can see three almost identical images below. Can you spot the odd one out from them?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

What is the largest number you can write with just 3 digits?