One is to three as three is to five and five is to four and four is the magic number. What is the pattern?
Which wheel of car does not rotate when you turn your car right?
why number 8549176320 is one of a kind?
Can you solve this amazing hard number series problem? 7, 8, 10, 12, 16, 18 ?
Can you think of any three-dimensional shape that comprises of exactly two surfaces?
A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was. In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?
What jumps when it walks and sits when it stands?
Can you write down eight eights so that they add up to one thousand?
Replace the (?) with the correct mathematical signs to make the expression equal to 59. 18 ? 12 ? 4 ? 5 = 59
You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth. How long would it take for the machine to cut the roll if each cut took 4 secs?
On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday. Is this even possible? How can it be?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
