Question
The average of a set of 's' numbers is 10. If 20 is
added to the set, then the average of the set becomes 10.2. Find the value of '4 X (s - 6)'.Solution
Sum of all 's' numbers = 10s
ATQ:
(10s + 20) / (s + 1) = 10.2
Multiplying both sides by (s + 1):
10s + 20 = 10.2(s + 1)
10s + 20 = 10.2s + 10.2
20 - 10.2 = 10.2s - 10s
9.8 = 0.2s
s = 49
4 X (s - 6):
4 X (49 - 6) = 4 X 43 = 172
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