tres chicas elegantes ('smart', meaning 'chic')
Tres chicas inteligentes ('smart' meaning 'intelligent')
Las muchachas indias (hindúes) son muy inteligentes.
The word for street smart is: vivo(a).
el es inteligente
perro inteligente
Ella es inteligente.
Three in Spanish is "tres".
millas
It would depend on the context, but to use "smart" as an adjective you should say inteligente.
No es inteligente Inteligente no es
No las niñas.
This may be bragging, but the translation is "Soy inteligente."(The other Spanish word for smart, elegante, means to look nice, to be elegant.)
probably