Respuesta :

[tex]\bf \stackrel{cost}{C}=15\stackrel{watches}{n}+85\qquad \boxed{C=385}\qquad \stackrel{cost}{385}=15n+85 \\\\\\ 380=15n\implies \cfrac{380}{15}=n\implies \cfrac{76}{3}=n\implies 25\frac{1}{3}=n[/tex]

so, 25 whole watches and hmmmm just the wristband of another maybe.

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