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The average age of a class of 35 student...

The average age of a class of 35 students is 15 years. If the teacher's age is also included the average age Increases by one year. Furthermore, if the average age of the teacher's family having a wife and a son is 40 years and the son's age in 80% less than his-mother's age, then the age of the teacher's wife is

A

57.5 years

B

50 years

C

47.5 years

D

55.5 years

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