If an electric train is travelling south, then which way is the smoke going?

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

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

How could a baby fall out of a twenty-story building onto the ground and live?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?