What's the next in the series?

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

Can you count the number of triangles inside a triangle?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Decode below rebus
D
N
A
T
S , D

Three men in a cafe order a meal the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognises the three as friends and asks the waiter to return $5 to the men.

The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.

Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14. Where has the other $1 gone from the original $15?

what's the probability of getting a king or a queen from a pack of 52 cards?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

I taste better than I can smell. Who am I?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?