Question
The average of a set of s numbers is 18. If 30 is added
to the set, then the average of the set becomes 18.3. Find the value of 5 X (s - 15).Solution
Sum of all 's' numbers of the set = 18 X s = '18s' ATQ; (18s + 30)/(s + 1) = 18.3 Or, 18s + 30 = 18.3s + 18.3 Or, 30 - 18.3 = 18.3s - 18s Or, 11.7 = 0.3s So, s = 39 So, required value = 5 X (39 - 15) = 120
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