If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

There is something which is always coming but never arrives?

Take away the whole and some still remain. What is it?

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

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

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 ?

When can we add 2 to 11 and get 1 as the correct answer?

I have Rs.50 and I spend it in the way as below.

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I