What is in seasons, seconds, centuries and minutes but not in decades, years or days?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

The more of this there is, the less you see. What is it?

Give it food and it will live; give it water and it will die.

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

Solve the counting riddle by identifying the number of triangles in the given picture.

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?