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?

What month of the year has 28 days?

What has no start, end, or centre?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

what's the probability of getting a king or a queen from a pack of 52 cards?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Which tank will fill first?

What seven-letter word has hundreds of letters in it?