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2014-09-04T11:32:50+03:00

a+b+c=21   0,2a/ (1/3) =0,25b/(35/48)= 0,3c/1   ⇒0,6a=12b/35 =c     ⇒ b=7/4·a = 1,75a    c=0,6a ⇒ a+1,75a+0,6a = 21 ⇒ 3,35a = 21     a=21/3,35 = 2100/335 = 420/67    a=420/67    b=7/4×420/67 = 735/67  b=735/67      c=0,6 ·420/67 = 252/67   c=252/67      (verifica daca enuntul sau calculele sunt corecte)