Question
The average of a set of s numbers is 14. If 20 is added
to the set, then the average of the set becomes 14.25. Find the value of 3 X (s - 3).Solution
Sum of all 's' numbers of the set = 14 X s = '14s' ATQ; (14s + 20)/(s + 1) = 14.25 Or, 14s + 20 = 14.25s + 14.25 Or, 20 - 14.25 = 14.25s - 14s Or, 5.75 = 0.25s So, s = 23 So, required value = 3 X (23 - 3) = 60
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