Exercise :: Average  Important Formulas
 Average  Important Formulas
 Average  General Questions
 Average  Data Sufficiency 1
 Average  Data Sufficiency 2

Average:
Average = Sum of observations Number of observations 
Average Speed:
Suppose a man covers a certain distance at x kmph and an equal distance at y kmph.
Then, the average speed druing the whole journey is 2xy kmph. x + y