"andres andres le pago a carlos 1550 en billetes de 100 y 50 en total le dio 21 billetes ¿cuantos eran de 50?
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A+B=21
entonces:
100.A+50.B=1550
2A+B=31
A+B=21(-)
-A-B=-21
2A+B=31
-A-B=-21
A=10 B=11