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The average age of 100 nurses in a nursi...

The average age of 100 nurses in a nursing home in 1982 was 50 years in 1984 20 nurses retired from their job whose average age was 60 years. After a huge gap in 1987 40 nurses were employed whose average age was 38 years . The average age of all the nurses in 1990 was:

A

53 years

B

51 years

C

48.5 years

D

data insufficient

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The correct Answer is:
B
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