The youngest of 4 children has siblings who are 3, 6, and 7 years older than she is. If the average (arithmetic mean) age of the 4 siblings is 30, what is the age of the youngest sibling? Choose one:	A) 22	B) 23	C) 24	D) 25	E) 26
x + (x+3) + (x+6) + (x+7) = 120   4x + 16 = 120   4x = 104   x = 26   The answer is 26.
<result>E</result>
The youngest of 4 children has siblings who are 3, 6, and 7 years older than she is. If the average (arithmetic mean) age of the 4 siblings is 30, what is the age of the youngest sibling?