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The fifth grade elementary school people's education edition mathematics volume one synchronous exercise page 39 the last problem is solved by equation.
Let the number of books on the lower shelf be x and the number of books on the upper shelf be1.5x.

∴x+5= 1.5x-5

∴0.5x= 10

∴x=20

So there are 30 books on the upper floor and 20 books on the lower floor.

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