The overall age of X and Y is 19 year greater than the overall age of Y and Z. Z is how many decades younger that X?  Answers
A) 11	B) 15	C) 12	D) 19	E) 20
19   19   (X + Y) â€“ (Y + Z) = 19   X â€“ Z = 19
<result>D</result>
The overall age of X and Y is 19 year greater than the overall age of Y and Z. Z is how many decades younger that X?