Question
Average age of 20 men is 40 years and average age of
'n' women is 30 years. If average age of all is 34 years, then find the value of (n - 2).Solution
Sum of ages of men = 20 × 40 = 800 Sum of ages of women = 30n (800 + 30n) ÷ (n + 20) = 34 Or, 800 + 30n = 34n + 680 Or, 4n = 120 Or, 'n' = 30 Required value = 30 - 2 = 28
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