Question
The average of a set of 's' numbers is 15. If 60 is
added to the set, then the average of the set becomes 15.5. Find the value of '4 X (s - 10)'.Solution
Sum of all 's' numbers = 15s
ATQ:
(15s + 60) / (s + 1) = 15.5
Multiplying both sides by (s + 1):
15s + 60 = 15.5(s + 1)
Simplifying:
15s + 60 = 15.5s + 15.5
60 - 15.5 = 15.5s - 15s
44.5 = 0.5s
s = 89
4 X (s - 10):
4 X (89 - 10) = 4 X 79 = 316
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