Answer:
Divide 15 by 5,which is 3, multiply 3 by 4, which is 12. so 15 are spy books.
~CoCo❤
12
Step-by-step explanation:
Let's turn the fifteen into a fraction.
15/1
Now multiply.
15/1 x 4/5 = 60/5, or 12/1, known as 12.
Hope this helps :)
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