Find The Next Number in the series: 12 13 15 17 111 113 117 119 123 ?
Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?
Complete the table series riddle by finding the number that can replace "??".
There are 2 sand hourglasses. The small one can measure 5 hours and the large one can measure 7 hours. How can we measure 16 hours with 2 sand hourglasses running together ?
What does a man do only once in his lifetime, but women do once a year after they are 29?
Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?
John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?
A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?
Can you solve the photo plexer logic ?
What does this say? XLR8
The peacock is a bird that does not lay eggs. How do they get baby peacocks?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.