Question
The average of a set of s numbers is 32. If 50 is added
to the set, then the average of the set becomes 32.5. Find the value of 2 X (s + 5).Solution
Sum of all 's' numbers of the set = 32 X s = '32s' ATQ; (32s + 50)/(s + 1) = 32.5 Or, 32s + 50 = 32.5s + 32.5 Or, 50 - 32.5 = 32.5s - 32s Or, 17.5 = 0.5s So, s = 35 So, required value = 2 X (35 + 5) = 80
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