Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

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

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

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)

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Can you find the missing piece of the Porsche?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?