Question

 The average salary of 30 officers in a firm is Rs.120 and the average salary of laborers is Rs. 40. Find the total number of laborers if the average salary of the firm is Rs. 50.​

Answer 1

Answer:

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Step-by-step explanation:

=> The sum of salary of officers will be = 30×120 = 3600

=> Let the number of labourers = X.

=> ATQ, 3600 + 40X = 50(30+X)

=> 2100 = 10X

=> X= 210

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Answer 2

Answer: x = 210

Step-by-step explanation:

average = sum of observation / number of observation

given

sum of salary of officers = 120 x 30 = 3600

let labours be x

then sum of salary of laborer = 40x

total strength of office = 30+x

and also total salary of all people working in the office= (30 +x)(50)

also the sum will be equal to individual sum of 3600 and 40x

therefore

3600 + 40x = 1500 + 50x

2100 = 10x

x = 210

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