Question

3A+5B=165000 2A+4B=122000

Answer 1

$\left \{ {{3A+5B=165000} \atop {2A+4B=122000}} \right.$
$\left \{ {{3A+5B=165000(x-2)} \atop {2A+4B=122000(x3)}} \right.$
$\left \{ {{-6A-10B=-330000} \atop {6A+12B=366000}} \right.$
$2B=36000 \\ B=18000$
Reemplazando:
$3A+5B=165000 \\ 3A+5(18000)=165000 \\ 3A+90000=165000 \\ 3A=165000-90000 \\ 3A=75000 \\ A=25000$
RESPUESTAS
$B=18000 \\ A=25000$