Usando proporciones, se encuentra que 400 africanos han participado.
En total, hay x participantes.
de los corredores son europeos, o sea:

Los americanos son la dècime parte de los europeos, o sea:

Los africanos son la quinta parte de los americanos, o sea:

En la carrera han inscritos 24 000 participantes, o sea,
. Por eso, la cantidad de africanos es:

Para obtener más información sobre las proporciones, puedes visitar a brainly.com/question/24615636
Answer:
(n/8)+13
Step-by-step explanation:
This is a screen shot of an online calculator called mathportal.com it shows the work used to find the answer to this question
Hope this helped and have an amazing day :)
-yO mAmA
Answer: 42
Step-by-step explanation:
if the bookstore has 64 copies,
yesterday it was sold 1/4 , so it was sold 64/4=16
today it was sold 1/8 from what remained, which is 6(see below)
64-16=48
48/8=6
the store has left 48-6=42