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"El resto" is a form of "resto", a noun which is often translated as "rest". "Lo demás" is a phrase which is often translated as "the rest". Learn more about the difference between "el resto" and "lo demás" below.
el resto(
rrehs
-
toh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
los restos
A plural noun indicates that there is more than one person, place, thing, or idea.
4. (remainder)
a. remains
Visitamos los restos del templo antiguo durante nuestras vacaciones.We visited the remains of the ancient temple on our vacation.
c. wreckage (of an accident)
La caja negra fue encontrada a 100 metros de los restos del avión.The black box was found 100 meters away from the wreckage of the airplane.