leer leer con atención y así como respondes mucho cuidado
I’ve attached my work below...
Hope this helps!
24 the answr is 24 this was mad easy
Answer:

Step-by-step explanation:
Since there are 20 students, this will be the denominator.
Now, to find how many students have a dog and a cat, you need to subtract all the numbers with 20. The leftover number will be the amount of students.
7+8+8=23
23-20=3
So, there are 3 students who have a dog and a cat.
So, the fraction will be 