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practice questions

31. Bookshelf

Three books are placed side by side, like in the picture. The left purple book has 220 pages, the middle yellow book has 200 pages, and the right green book 210 pages. How many pages lie between first page of the purple book and the last page of the green book?

The purple book's front cover is next to the yellow book's back cover.

The green book's back cover is next to the yellow book's front cover.

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