alan y Pedro comen en la misma escuela pero alan asiste cada 5 días y Pedro cada 7 ¿si coincidieron hoy lunes 10 de enero, cuando volverán a encontrarse​

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.