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Q.

In an office, 40% of the staff is female. 70% of the female staff and 50% of the male staff are married. The percentage of the unmarried staff in the office is

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a

42

b

60

c

54

d

64

answer is A.

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Detailed Solution

$T o t a l ↙ ↘ \begin{array}{lcc} Males & Females \\ 60 & 40 \\ Married & \to 30 & 28 \\ Unmarried & \to 30 & 12 \\ Total unmarried & = 30 + 12 = 42 \end{array}$

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In an office, 40% of the staff is female. 70% of the female staff and 50% of the male staff are married. The percentage of the unmarried staff in the office is