What does this Rebus Picture mean?

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

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

Suppose you are a girl candidate and sitting in an interview. Suddenly the interviewer asks you, 'What if one morning you wake up and find out that you are pregnant?

How will you reply to such a question?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

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 ?

What has one letter and starts with an E?

What word is pronounced the same if you take away four of its five letters?