Question

average salary of 19 workers is 12000 per month and the salary of manager is 42000 per month find the average monthly salary of all employees

Answer 1

average salary of 19 workers = 12000 per month
total salary of 19 workers/ 19 = 12000
total salary of 19 workers = 12000 x 19 = 2,28,000 per month
Manager salary = 42000 per month
19 workers + manager = 20 employees
total salary of 20 employees = 228000 + 42000 = 2,70,000
Average salary of all employees = 2,70,000/20 =  Rs13,500 per month

Answer 2

n1 = 19
n2 = 1

x1 =12000
x2 = 42000

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combined average mean = n1(x1) + n2(x2)
                                         ---------------------------------
                                                 n1 + n2

= 19(12000) + 1(42000)
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              20

= 228000 + 42000
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              20

=270000/20

=13500
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average monthly salary of all employees is 13500