Răspuns: bec mic 4 si bec mare 6
Explicație pas cu pas: 6becuri mari+6becuri mici =60
12 becuri mari+6 becuri mici=96
6 becuri mari =96-60
6 becuri mari=36
1 bec mare=6
36+6 becuri mici=60
6 becuri mici=60-36
6 becuri mici=24
1 bec mic=24/6
1 bec mic =4