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Juan pagó S/50 por 3 cajas de tarugos y 5 cajas de clavos. Pedro
compró 5 cajas de tarugos y 7 de clavos, por lo que tuvo que
pagar S/74. ¿Cuál es el precio de cada caja de tarugos?
a S/7
b) S/5
C S/6
d S/12​