Answer:
both : Sal or his sister
Step-by-step explanation:
comic books: 8
detective books: 4
total books: 12
so 8/12 books are comic books, so Sal was right
But, his sister could also be right because 8/12 and 2/3 are proportional
proportional: this when they have the same ratio or they are equivalent
2/3 times 4/4 = 8/12