What number comes next in the series?

5 15 5 18 5 24 14 20 _

Make a sentence consisting of three words that have the whole alphabet.

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

What 5-letter word typed in all capital letters can be read the same upside down?

In which direction should the missing arrow point?

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