Răspuns:
a,b,c dp 3,4,5 => a/3=b/4=c/5 ; a+b+c=60
a/3=b/4 => 4a=4b => a=3b/4
b/4=c/5 => 5b=4c => c=5b/4
a+b+c=60 => 3b/4+b+5b/4=60 (aducem la acelasi numitor (4) si dupa impartim cu 4 sa scapam de el)
3b+4b+5b=240
12b=240 => b=20 => a=3b/4=15
c=5b/4=20
