Question
The average of a set of 's' numbers is 50. If 120 is
added to the set, then the average of the set becomes 50.4. Find the value of '4 X (s - 20)'.Solution
Sum of all 's' numbers = 50s
ATQ:
(50s + 120) / (s + 1) = 50.4
Multiplying both sides by (s + 1):
50s + 120 = 50.4(s + 1)
50s + 120 = 50.4s + 50.4
120 - 50.4 = 50.4s - 50s
69.6 = 0.4s
s = 174
4 X (s - 20):
4 X (174 - 20) = 4 X 154 = 616
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