Question

daca 6 tricouri si 7 bluze costa 209 lei, iar 10 bluze si 6 tricouri costa 260 lei. Cat costa o bluza?

Answer 1

6T----7B----209lei
6T----10B----260lei
aflam care bluze sunt in plus
10-7=3B
aflam cat costa 3B
260-209=51lei
aflam caf costa 1B
51:3=17lei
aflam cat costa 7B
7*17=119lei
aflam cat costa 6T
209-119=90lei
aflam cat costa1T
90:6=15

15*6T------17*7B-----209lei
15*6T------17*10B----260lei
T=tricouri
B=bluze