How many squares are there in the given figure?

In the following question, select the number which can be placed at the sign of question mark(?) from the given alternatives.

20 : 30 : : ? : 72 

Six girls are standing in a circle facing the center. Bindu is at the left of Biji. Rekha is between Bindu and Mumtaz. Jessa is between Biji and Nirmala. Who at the left of Mumtaz?

If 8th of April falls on Mon day. what would be the 30th day of that month? 

Pointing to a man in a photograph a woman says. He is the father-in-law of the wife of only paternal grandson of my own father-in-law. How is woman related to man? 

Stethoscope: Heartbeat:: ? : Temperature