The average salary of the entire staff in an office is Rs. 3200 per month. The average salary of officers is Rs. 6800 and that of non-officers is Rs. 2000. If the number of officers is 5, then find the number of non-officers in the office?
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Let the number of non-officers be n
Total of all pay = total of "nons" pay + total of officers pay
3200(n + 5) = 2000n + 5*6800
1200n = 34000 – 16000 = 18000
no of non officers=15
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