Average age of a group of 10 children is 12 years. If a child leaves the group, then the average of remaining 9 children becomes 11 years. What is the age (in year) of the child who left the group?

Average age of a group of 10 children is 12 years. If a child leaves t

1.	Average age of a group of 10 children is 12 years. If a child leaves the group, then the average of remaining 9 children becomes 11 years. What is the age (in year) of the child who left the group?
A.	20
B.	21
C.	22
D.	19
Answer» C. 22