Find the average number of employees in HR, Sales and Operation together.
Total number of employees in HR department = 150 × (1/3) = 50 Let total employees in Management and Sale be x and 3x respectively. And, total employees in Operation = 50 × (1 – 20/100) = 40 => 50 + x + 3x + 40 = 150 => 4x = 60 => x = 15 Required average = (50 + 45 + 40)/3 = 45