The average (arithmetic mean) of 20, 60, and 100 is 10 more than the average of 40, 80, and which of the following?
A) 110
B) 90
C) 70
D) 50
E) 30
A) 110
B) 90
C) 70
D) 50
E) 30
Average of (20,60,100) = 180/3 = 60
Given 60 is 10 more than average of (40,80,x)
(or) Avg of (40,80,x) = 50
120+x = 3(50)
[spoiler]x = 30 (E)[/spoiler]
