Question
The average of a set of 's' numbers is 30. If 50 is
added to the set, then the average of the set becomes 30.2. Find the value of '4 X (s - 5)'.Solution
Sum of all 's' numbers = 30s
ATQ:
(30s + 50) / (s + 1) = 30.2
Multiplying both sides by (s + 1):
30s + 50 = 30.2(s + 1)
30s + 50 = 30.2s + 30.2
50 - 30.2 = 30.2s - 30s
19.8 = 0.2s
s = 99
4 X (s - 5):
4 X (99 - 5) = 4 X 94 = 376
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