Question
The average of a set of 's' numbers is 20. If 80 is
added to the set, then the average of the set becomes 20.5. Find the value of '4 X (s - 12)'.Solution
Sum of all 's' numbers = 20s
ATQ:
(20s + 80) / (s + 1) = 20.5
Multiplying both sides by (s + 1):
20s + 80 = 20.5(s + 1)
20s + 80 = 20.5s + 20.5
80 - 20.5 = 20.5s - 20s
59.5 = 0.5s
s = 119
4 X (s - 12):
4 X (119 - 12) = 4 X 107 = 428
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