Answer:
90
Explanation:
48 divided by 8 is 6 so you multiply 7 times 6 equals 42 so 42 plus 48 is 90
90 books were sold total
If it's 8:7, and 48/8=6, you have to do 6x7=42 to get a 48:42 ratio, which is equivalent to 8:7. Then, you add 48+42=90
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