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we know 500<x1<x2<x3<x4

we want to find if:
(500+x1+x2+x3+x4)/5 > 600
thus
we want to find if
x1+x2+x3+x4 > 2500


(1) (x2+x3+x4)/3 = 700

x2+x3+x4 = 2100

thus from the equation above
x1+x2+x3+x4 > 2500

x1+2100 > 2500
x1>400

this is certainly true given that x1>500 by definition
SUFFICIENT
(2)

(x1+x2)/2 = 550

x1+x2 = 1100
x1+x2+x3+x4 > 2500
1100+x3+x4 > 2500
x3+x4 > 1400 ?

we cannot be sure, we only know that 500<x1<x2<x3<x4
thus the sum of x3 and x4 will surely be bigger than that of x1 and x2
x3+x4>x1+x2
x3+x4 > 1100
--> so x3+x4 might be 1200, thus x3+x4 > 1400 is not true
--> x3+x4 might be 1500, thus x3+x4 > 1400 is true

NOT SUFFICIENT
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