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In a firm the average salary of male employees is Rs. 520 and that of females is Rs. 420. If the overall average salary is Rs. 500, then ratio of male and female employees will be
1. 70 : 30
2. 80 : 20
3. 78 : 22
4. 30:70 

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Correct Answer - Option 2 : 80 : 20

Given:

In a firm the average salary of male employees  = Rs. 520

in a firm the average salary of female employees = Rs. 420

the overall average salary =  Rs. 500,

Formula used:

Average = (n1 × X1 + n2 × X2)/(n1 + n2)

Calculation:

 500 = (M × 520 + F × 420)/(M + F)

⇒ 500M + 500F = 520M + 420F

⇒ 80F = 20M

⇒ M : F = 80 : 20

∴ The required ratio of Male and Female is 80 : 20.

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