81 x 9 = 801. What must you do to make the this equation true?

Replace the question mark in the picture below.

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Katniss and Peeta are liars. They both lie on some specific days.

Katniss lies on Fridays, Saturdays and Sundays. She speaks the truth on all other days.

Peeta lies on Tuesdays, Wednesdays and Thursdays. He speaks the truth on all other days.

Can you tell that one day of the week when both of them will say "Tomorrow, I will lie."?

What time is it when an elephant sits on a fence?

A spaceship was lost. The detective was given a piece of paper. This was the location of the spaceship! This is what the slip had scribbled on it:
Juice, Umbrella, Potato, Ice, Tomato, Elephant, Rice.

Where is the spaceship?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

Can you count the number of lines in the below picture?

What makes this number unique: 8,549,176,320?