There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Alex opened 24 presents
Jonah opened 8 presents
Clara opened 1 present

Can you find out how many presents were opened by Candy?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?