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2014-11-19T18:09:06+02:00
(a+b)/2=17 ⇒a+b=17*2⇒ a+b=34
(c+d)/2=33⇒ c+d=33*2⇒ c+d=66
(e+f)/2=40⇒  e+f=40*2⇒  e+f=80