Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

How many sides does a circle have?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

Take away the whole and some still remain. What is it?

When it's bad luck to meet a black cat?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?