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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