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

What is black when you buy it, red when you use it, and gray when you throw it away?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

What is next number in the pattern below:

131 517 192 123 ?

Solve the puzzle by telling what does below picture means.

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Can you find the missing piece of the Porsche?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?