Mathematical Reasoning and Aptitude
5.31
Example
144:
The average salary of male employees in a
firm was
`
6000 and that of females was
`
5600. The mean
salary of all the employees was
`
5800. What is the % of
female employees?
(a) 42%
(b) 50%
(c) 55%
(d) 62%
Solution:
Average salary of male employees
=
`
6000
Average salary of female employees
=
`
5600
Mean salary
=
`
5800
By using allegation
(6000)
(5600)
(5800)
200
200
∴
The ratio of male : female
=
200:200
=
1:1
Hence, % of female employees
=
1
2
×
100
=
50%
Therefore, option (b) is correct.
Example
145:
Average present age of father, mother ...
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