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Answer:
18 notifications books to 4 cookbooks
2 cookbooks to 9 notifications books
8 novels to 12 notifications books.
Explanation:
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3 notifications books to 2 novels
then
18 notifications books to 12 novels
then
12 novels to 4 cookbooks
finally, we get 18 notifications books to 4 cookbooks
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2 cookbooks to 6 novels
then
6 novels to 9 notifications books
finally ,we get 2 cookbooks to 9 notifications books
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2 novels to 3 notifications books
Finally ,we get 8 novels to 12 notifications books.
:)