Question
The average of a set of 's' numbers is 35. If 90 is
added to the set, then the average of the set becomes 35.5. Find the value of '4 X (s - 15)'.Solution
Sum of all 's' numbers = 35s
ATQ:
(35s + 90) / (s + 1) = 35.5
Multiplying both sides by (s + 1):
35s + 90 = 35.5(s + 1)
35s + 90 = 35.5s + 35.5
90 - 35.5 = 35.5s - 35s
54.5 = 0.5s
s = 109
4 X (s - 15):
4 X (109 - 15) = 4 X 94 = 376
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