Question
The average of a set of 's' numbers is 25. If 100 is
added to the set, then the average of the set becomes 25.2. Find the value of '4 X (s - 9)'.Solution
Sum of all 's' numbers = 25s
ATQ:
(25s + 100) / (s + 1) = 25.2
Multiplying both sides by (s + 1):
25s + 100 = 25.2(s + 1)
25s + 100 = 25.2s + 25.2
100 - 25.2 = 25.2s - 25s
74.8 = 0.2s
s = 374
4 X (s - 9):
4 X (374 - 9) = 4 X 365 = 1460
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