A side of a square vegetable field is 25 meters long. If a fence is to be built around it, a stake needs to be drilled every 5 meters, and four vertices must be drilled. How many wooden stakes should be prepared in total?
一块正方形菜地边长25米，要在它的周围装上篱笆，每隔5米需打一根桩，四个顶点都要打，一共要准备多少根木桩．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 * (4/5)</gadget>
<output>20</output>

<result>20</result>