Final answer:
The weight of 12 books, each weighing 5/8kg (the weight of 8 books), is 7.5 kg.
Step-by-step explanation:
This question is about proportional mathematics. If 8 books have the weight of 5kg, each book weighs 5/8 kg. To find the weight of 12 such books, we have to multiply the weight of a single book by 12.
Let's solve:
Single book's weight = 5kg / 8 = 0.625kg/book
Weight of 12 books = 12 books x 0.625kg/book = 7.5kg
So, the weight of 12 such books is 7.5 kg which corresponds to option A.
Learn more about Proportional Mathematics