When 99 is considered higher than 100?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Which digit occurred maximum times between the number 1 and 1000?

Solve the following series:
AZ, GT, MN, __, YB

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

You need to arrange three 7 and mathematical symbols to form number 1?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

why number 8549176320 is one of a kind?