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2014-09-03T20:59:44+03:00
1) ma=(x+y+z)/3=28

x+y+z=3*28
x+y+z=84

2) 3+6+9+..+297=150x

n=(297-3):3+1
n=294:3+1
n=98+1
n=99

(3+297)*99/2=150x

300*99/2=150x

150*99=150*x

x=99