There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

What occurs twice in a week, once in a year but never in a day?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Alex opened 24 presents
Jonah opened 8 presents
Clara opened 1 present

Can you find out how many presents were opened by Candy?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Imagine you are in a room with no windows or doors. How will you get out?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?