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5000a + 2000b = 115000
a = 32-b
5000*(32-b) + 2000b = 115000
160000-5000b + 2000b = 115000
160000-115000 = 5000b-2000b
45000 = 3000b
b = 45000/3000 = 15
a = 32-b = 32-15 = 17
Comprobación:
(5000*17) + (2000*15)= 115000
85000 + 30000 = 115000
Respuesta:
17 billetes de 5000
15 billetes de 2000