Question

span >The average age of a group of 10 students is 20 years. Two persons of age 25 years and 20 years, left the group and 2 persons of age 26 years and 29 years, joined the group. Find the new average age of the group.

A 17 years
B 19 years
C 13 years
D 21 years
E None of these
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