a+b+c=365
2/3 ·b=a;
c=a/2+47
⇒c=[2/3 ·b]/2+47
⇒c=2b/3/2+47
⇒c=2b/3·1/2+47
⇒c=2b/3·2+47
⇒c=2b/6+47
⇒c=b/3+47;
⇒a=2b/3;
⇒a+b+c=365
⇒2b/3+b+b/3+47=365
⇒2b/3+b+b/3=365-47
⇒2b/3+b+b/3=318
⇒2b/3+3b/3+b/3=318
⇒[2b+3b+b]/3=318
⇒6b/3=318
⇒2b=318
⇒b=318/2
⇒b=159;
⇒a=2b/3
⇒a=[2·159]/3
⇒a=2·53
⇒a=106;
⇒c=b/3+47
⇒c=159/3+47
⇒c=53+47
⇒c=100;