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

People put me on the table and cut me but do not eat me. What am I?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

I’m tall when I’m young, and I’m short when I’m old. What am I?

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?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

I know a nine-letter word having only one vowel.
Do you ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.