Răspunsuri

2014-04-02T21:48:23+03:00
(a+b+c)/3=25  => a+b+c=75 ; a=b+4; (a+c)/2=30 => a+c=60... In a+b+c=75 inlocuisti a+c cu 60 si iti da : 60+b= 75 => b=15 , a=15+4 = 19 , 19+c=60 => c=41