Răspuns:
71 avioane
15 elicoptere
Notam cu:
a - numarul avioanelor
e - numarul elicopterelor
[tex]\display\style\bf\ a+e = 86\\\\a-8 = 3*(e+6)\\\\a - 8 = 3e +18\\\\a = 3e+18+8\\\\\boxed{\display\style\bf\ a = 3e+26}\\\\inlocuim\: pe\: a\: in\: prima\: relatie,\: adica\: in\: suma\\\\3e+26+e=86\\\\4e + 26 = 86\\\\4e=86-26\\\\4e = 60\\\\e = 60:4\\\\ \boxed{\display\style\bf\ e = 15}\\\\a+15 = 86\\\\a = 86-15\\\\\boxed{\display\style\bf\ a=71}\\\\Verificare: 15+71 =86\\\\71-8 = 3 * (15+6)\\\\63=3*21\\\\63=63\:(adevarat)[/tex]