Answer:
9.77777777768kg
Explanation:
81 books= 9kg
so, one book= 9/81= 0.11111111111111
Therefore, 88 books(88x0.1111111)
Answer: 9.77777777768kg
9/81= kg per book= 1/9 kg
88 books weigh 1/9*88=88/9 kg = 9.77 kg
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