The thickness of an ordinary newspaper is about (4/5) mm. If 40 such newspapers are stacked together, what is their thickness?
一张普通报纸的厚度大约是(4/5)毫米，如果把40张这样的报纸摞在一起，那么它们的厚度是多少？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * 40</gadget>
<output>32</output>

<result>32</result>