Teacher Wang bought 20 pencils and 5 pens for a total of 32 yuan. The unit price of a pen is 4 times that of a pencil, how much is each pen.
王老师买20枝铅笔和5枝钢笔一共32元．钢笔的单价是铅笔的4倍，钢笔每枝多少元．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">20 + 20</gadget>
<output>40</output>

<gadget id="calculator">32 / 40</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">4 * (4/5)</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>