Find the missing number (X and Y) in the series and find the value of Y - X: 10, 30, 20, X, 50, 150, Y

Find the missing number (X and Y) in the series and find the value of

1.	Find the missing number (X and Y) in the series and find the value of Y - X: 10, 30, 20, X, 50, 150, Y
A.	10
B.	80
C.	90
D.	100
Answer» B. 80