Question

Intr-un bloc sunt 14 apartamente de 2 si 3 camere. Daca in total sunt 37 de camere, afla cste aparamente?

Answer 1

x+y=14
2x+3y=37

unde x=ap cu 2 camere, y=ap cu 3 camere

x+y=14⇒x=14-y
2x+3y=37⇒2(14-y)+3y=37
28-2y+3y=37
y=37-28
y=9
dar x+y=14⇒x=14-y
x=14-9
x=5  si  y=9
verificare
x+y=14

5+9=14
14=14