What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

What is the difference between a jeweller and a jailer?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

Can you count the number of squares in the figure below?

There is a dressing drawer which contains the following coloured socks in pairs: Purple, Magenta, Crimson, White, Yellow and Turquoise. Now, the socks are paired and each pair is together in the matching set. There is no light in the room and you open the drawer and pick up a pair. Then, without noticing any colour, you keep them back and pick them up again.

Can you calculate the probability that the pair of socks was Yellow both times?

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?

What does below Rebus say?

XLR8

Why is a river so rich ?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)