Answer:
2 books.
Explanation:
Because 7×2 is 28 and the goal is thirty and we can't get any higher than that so you can multiply it 4 time and get a leftover of 2.
2 books
If each box can hold seven books you can do 7 x 4 and get 28. From there you have two books left over and 4 full boxes. Hope this helps.
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