Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

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.

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

In an office's desk, you find a unique method that shows the current day of the month. Two numbered cubes are used to depict the current date.

Can you find out the numbers on both the cubes so that each date can be mentioned using them?

Please note that you have to use both the cubes to display any date. Thus the 1st day must be represented by 01 and so on.

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Identify the hidden meaning behind this picture?

John is the son of Jacob.
So,
Jacob is the_____of John's father?