Question

The average age of a group of four children is 11 years. From the group, one child, whose age was 6 years more than the average age, left. Four new children, whose average age is 5 years more than the given average age, join the group. Find the new average age.

A 10.5 years
B 9 years
C 8.5 years
D 13 years
E 8 years
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