Plz solve( central tendency)

Dear CCI members, plz guide me to solve these problems from ICAI Book.

1. If the A.M and H.M for two numbers are 5 and 302 respectively then what is GM ? Ans: 4

2. The Average Salary of a group of unskilled workers us Rs.10,000 and that of a group of skilled workers in Rs.15000. If the Combined salary is Rs.12000, then what is the percentage of skilled workers? Ans: 40%

Replies (1)

2. no skilled person be x, then no of unskilled persons = 100-x,

now, avg = total salary/ no of persons

10000(100-x)+15000x / 100 = 12000

1000000-10000x+15000x=1200000

5000x=200000

x=40

skilled workers=40%

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