The youngest of 4 children has siblings who are 3, 5, and 8 years older than she is. If the average (arithmetic mean) age of the 4 siblings is 21, what is the age of the youngest sibling?	Answers:
A) 17  B) 18  C) 19  D) 21  E) 22
Total age of the 4 sibling is 21 x 4 = 84 years ..   We already have the total age of all the children is 4y + 16   So, 4y + 16 = 84   Or, 4y = 68   Or, y = 17   So, Age of the youngest child is 17 years.   17NSWER:17
<result>A</result>
The youngest of 4 children has siblings who are 3, 5, and 8 years older than she is. If the average (arithmetic mean) age of the 4 siblings is 21, what is the age of the youngest sibling?