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Formulas of Problems on Average - Aptitude Questions and Answers.

TIPS FOR SOLVING QUESTIONS RELATED TO AVERAGE:

1. The average of a number of quantities of the same kind is equal to their sum divided by the number of those quantities. Thus,

Average =  Sum of the quantities 
                  Number of quantities

Also, Sum of the quantities = Average x Number of quantities.

2. If a man covers a certain distance at x km/h and an equal distance at y km/h.
Then, the average speed during the whole journey is given by

        2xy   km/h
x + y