Question

Intr-o parcare sunt 39 de autovehicule si biciclete , care au impreuna 102 roti . Cate biciclete sunt in parcare ?

Answer 1

x-biciclete; y-masini x+y=39/ 2x+4y=10 → x=39-y/ 2(39-y)+4y=102 → x=39-y/ 78- 2y+4y=102 → x=39-y/ 2y=24 → x=39-y/ y=24:2 → x=39-12/ y=12 → x=24/ y=12 Răspuns : 24 biciclete