Question
The average salary of the entire staff in an office is
Rs. 30000 per month. The average salary of officers is Rs. 40000 and that of non-officers is Rs. 25000. If the number of officers is 10, find the number of non-officers in the office.Solution
Let the number of non-officers = x => 25000x + 40000 × 10 = 30000 (10 + x) => 30000x - 25000x = 40000 × 10 - 30000 × 10 => 5000x = 400000 - 300000 => x = 100000/5000 = 20
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