Usages of treinta
Tengo treinta preguntas.
I have thirty questions.
Tengo treinta años y mi hermano tiene treinta y uno.
I am thirty years old and my brother is thirty-one.
¿Cuántos días tiene el mes, veintiocho o treinta?
How many days does the month have, twenty-eight or thirty?
Tienes muchas canas, pero llevamos treinta años sin vernos.
You have a lot of gray hairs, but we haven't seen each other in thirty years.
La mayoría de la población tiene más de treinta años.
The majority of the population is over thirty years old.
Más de treinta personas respondieron la encuesta.
More than thirty people answered the survey.
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