What number comes next in the series?

5 15 5 18 5 24 14 20 _

What has many keys but can’t open a single lock?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

If eleven plus two equals one, what does nine plus five equal?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

I am quite hot but become too cold if you remove the first two letters. What am I?