Question
The average monthly salary of 18 employees is Rs.
35,000. When two employees with salaries (n + 5000) and (n - 3000) are included, the average salary decreases by Rs. 1000. Find the value of (n - 20000).Solution
ATQ, New number of employees = 18 + 2 = 20 New average salary = 35000 - 1000 = 34000 20 × 34000 - 18 × 35000 = (n + 5000) + (n - 3000) Or, 20 × 34000 - 18 × 35000 = 2n + 2000 Or, 680000 - 630000 = 2n + 2000 Or, 50000 = 2n + 2000 Or, 2n = 48000 Or, n = 24000 Therefore, required value = n - 20000 = 24000 - 20000 = 4000
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