Răspuns :

Cata4id
4a/3b = 7.8 ⇒ a = (7,8 x 3b)/4
                       a = 1,95 x 3b
                     5a = 9,75 x 3b

5a/9b = (9,75 x 3b) / 9b (simplificam)  
          = 3,25
4a/3b=7,8→4a=23.4b→a=5,85b 5a/9b=5*5,85/9=29.25/9=3,25

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