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by shankar.ashwin » Thu May 31, 2012 9:08 am
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]
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by massi2884 » Thu May 31, 2012 9:10 am
Avg. of 20, 60, and 100 is (100+20+60)/3 = 60

60 is 10 more than 50

If 50 is the avg. of 3 numbers, their sum is 3x50 = 150

What is missing to 40 + 80 to get to 150 is 30 (E)
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