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RRB Group-D Model Paper 17 with answers for online practice
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© examsnet.com
Question : 23
Total: 100
The average salary of the entire staff in an office is Rs. 220 per month.The average salary of officers is Rs. 500 and that of non-officers is Rs. 110. If the number of officers is 11, then find the number of non-officers in the office.
61
28
41
45
Validate
Solution:
Let the required number of non-officers = x
Total salary = 110x + 500 × 11 = 220(11 + x)
⇒ 220x - 110x = 500 × 11 - 220 × 11
⇒ 110x = 5500 - 2420
⇒ x = 3080/110 = 28
∴ 28 is the number of non-officers in the office.
© examsnet.com
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