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HR department of a firm allots average salary per head of whole staff as Rs 140 and average salary of 5 executives is Rs 120, average salary per head of remaining staff  is Rs 150. Calculate total staff in the firm. 

HR department of a firm allots average salary per head of whole staff as Rs 140 and average salary of 5 executives is Rs 120, average salary per head of remaining staff  is Rs 150. Calculate total staff in the firm.  Correct Answer 15

Given:

Average salary per head = Rs 140

Average salary of 5 executives = Rs 120

Average salary of remaining staff = Rs 150

Calculation:

Let, total number of staff be X

⇒ (5 × 120) + ((X - 5) × 150) = 140 × X

⇒ 600 + 150X - 750 = 140X

⇒ 150X - 140X = 750 - 600

⇒ 10X = 150

⇒ X = 15

∴ Required answer is 15

Correct answer is option 3

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