Question

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Answer 1

Answer:

2 he needs to add 2 to keep the ratio the same, the total would be 12

Step-by-step explanation:

before he adds the book the ratio is 2:1 (fiction to non-fiction) and he add 4 to the fiction so he needs to add 2 non-fiction books because this ration means fiction/2 = non-fiction so 4/2 = 2

hope this helps have a blessed day :)