A book has 128 pages. Xiaolan reads (5/8) of the whole book in 4 days. How many pages does she read on average every day?
一本书128页，小兰4天读了全书的(5/8)，平均每天读多少页．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(5/8) / 4</gadget>
<output>5/32 = around 0.15625</output>

<gadget id="calculator">128 * (5/32)</gadget>
<output>20</output>

<result>20</result>