Count the number of times the letter "F" appears in the following paragraph: FAY FRIED FIFTY POUNDS OF SALTED FISH AND THREE POUNDS OF DRY FENNEL FOR DINNER FOR FORTY MEMBERS OF HER FATHER'S FAMILY.
You throw me out when you want to use me and you take me in when you don't want to use me. Who Am I?
I get hot but I never sweat, I cook food but I am not a chef, I have a door but you can't enter me, I have a light but I am not a lamp. Who am I?
A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log. Can you calculate the weight of the entire wooden log?
It can be easily calculated that the digits 0 to 9 can be arranged into 3628800 distinct ten-digit numbers. But do you know how many of these numbers are prime?
I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?
A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?
What is more useful when it is broken?
Always in you, Sometimes on you; If I surround you, I can kill you. What am I?
Which Burger Is Different in below image?
Twice ten are six of us, Six are but three of us, Nine are but four of us; What can we possibly be? Would you know more of us? Twelve are but six of us, Five are but four, do you see? What are we?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
