To find average of any number of quatities of the same kind is, to add all the items together and then divide the sum by the number of items.
|Average||=||Sum of all the given quantities||Number of the given quantities|
If a man earns Rs. 20, Rs. 25, Rs. 28, Rs. 23 and Rs. 24 on five consecutive days of week, he earns a total of= Rs. (20+25+28+23+24) = Rs. 120
To find his average earning per day, his total earning is divided by the number of days.
Average earning per day = 120/5 = Rs. 24
Average earning does not mean that the man earned everyday Rs. 24. But had he earned Rs. 24 everyday , his total earning in 5 days would have been 5 x Rs. 24 = Rs. 120