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

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

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

What English word has three consecutive double letters?

A man dies of old age on his 25 birthday. How is this possible?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

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

Can you place three balls such that the equation shown in the picture holds true?

What brings you down but never up?