Question

daca 3 monede de 10 bani si 4 monede de 50 de bani cantaresc 26 g ,iar 6 monede de 10 bani si 3 monede de 50 de bani cantaresc 27 g . cat cantareste fiecare monede

Answer 1

$3x+4y=26 si 6x+3y=27 \\ \left \{ {{6x+8y=52} \atop {6x+3y=27 \\}} \right. \\ \left \{ {5{y=25} \atop {3x+4y=26}} \right. \\ \left \{ {{y=5} \atop {3x+20=26 \\}} \right. \\ \left \{ {{y=5} \atop {x=2}} \right.$
x -greutatea monedei de 10 bani
y-greutatea monedei de 50 bani
Raspuns: 2g si 5g