What number comes next in the series?

5 15 5 18 5 24 14 20 _

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Replace the question mark with the number below given a simple math problem.

The cream is heavier than Milk. True or False?

what does the below rebus means?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

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

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

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)

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes