3, 5, 7, 12, 17, 19 

 Find the one which does not belong to that group ? 

What type of number is 2√7?

How much does a watch lose per day, if its hands coincide every 64 minutes?

The sum of the digits of a two-digit number is 1/4 of the number. If 9 is added to the number, the digits get reversed. Find the number.

A train 540 meters long is running at a speed of 54 km/h. The time taken by the train to cross a 180-meter-long tunnel is:

The numbers from 1 to 29 are written side by side as follows:

1234567891011121314..............2829

If this is divided by 9, then what is the remainder?

Ria told Mita, "The girl I met yesterday at the beach was the youngest daughter of the brother-in-law of my friend's mother". How is the girl related to Ria's friend?

 
A train 120 meters long is running with a speed of 60 km/hr. In what time will it pass a boy who is running at 6 km/hr in the direction opposite to that in which the train is going 

 There are six persons A. B, C, D, E and F. C is the sister of F. B is the brother of E's husband. D is the father of A and grandfather of F. There are two fathers, three brothers and a mother in the group. Who is the mother ?