A) 25
B) 30
C) 35
D) None of these
six numbers are: a,b,c,d,e,f
Then
a+b+c+d = 25×4 = 100
d+e+f = 35×3 = 105
a+b+c+d+e+f = 30×6 = 180
then the fourth number is:
d=100+105-180=25
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