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Answer:
There were 128 books about plants in the library
Step-by-step explanation:
First we look at the amount of books about mammals, which is 144.
Next we divide 144 by 9, since the ratio of books was 9 for mammals and 8 for plants. 144 / 9 = 16
now we multiply 16 by 8 since the ratio for plants was 8.
16 * 8 = 128
I hope this helps <3