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If the average age of 40 students in cla...

If the average age of 40 students in class I is 10 yr and the average age of 30 students in class II is 12 yr, then find the average age (in years) for all students.
(A) 11
(B) 10.54
(C) 10.58
(D) 10.85

A

B

B

D

C

C

D

A

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