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 The average salary of the entire staff in a office is Rs 250 per month. The average salary of officers is Rs 520 and that of non-officers is Rs. 200. If the number of officers is 15, then find the number of non–officers in the office
  • a)
    823
  • b)
    81
  • c)
    87
  • d)
    56
  • e)
    62
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The average salary of the entire staff in a office is Rs 250 per month...
-officers in the office.

Let the number of non-officers be x.

The total salary of officers is 15 * Rs. 520 = Rs. 7800.
The total salary of non-officers is x * Rs. 200.

The total salary of the entire staff is (15 + x) * Rs. 250.

According to the given information, the average salary of the entire staff is Rs. 250.

So we can write the equation as:

(15 * 520 + x * 200) / (15 + x) = 250

7800 + 200x = 250 * (15 + x)

7800 + 200x = 3750 + 250x

7800 - 3750 = 250x - 200x

4050 = 50x

x = 4050 / 50

x = 81

Therefore, the number of non-officers in the office is 81.
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Community Answer
The average salary of the entire staff in a office is Rs 250 per month...
Answer – B. 81 Explanation: Let the required number of non–officers = x 200x + 520 x 15 = 250 ( 15 + x ) 250x – 200x = 520 * 15 – 250 x 15 50x = 4050 x = 81
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