What is the fastest way to double your money?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Replace The Question Mark Below With the Correct Number.

2 {38} 3
4 {1524} 5
6 {3548} 7
8 {????} 9

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Can you count the number of children in the picture below

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

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