A bookshelf has upper and lower floors, and there are 128 books in total. The ratio of the number of books on the upper and lower floors is 5:3, how many books are more on the upper floor than on the lower floor?
一个书架有上、下两层，共放着128本图书．上、下两层图书本数的比是5：3，上层比下层多多少本图书？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(5/8) - (3/8)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">128 * (1/4)</gadget>
<output>32</output>

<result>32</result>