Question

span >The average age of a group of 20 students is 30 years. Two persons of age 50 years and 60 years, left the group and 2 persons of age 50 years and 40 years, joined the group. Find the new average age of the group.

A 23 years
B 25 years
C 27 years
D 29 years
E None of these
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