In order to welcome the school track and field games, students from Class 51 of Nanmo Primary School used a piece of red colored paper with a length of 5 decimeters and a width of 4 decimeters to make small red flags with a base and a height of 10 centimeters. How many such small red flags can be made at most?
为了迎接学校田径运动会，南莫小学五1班同学用一块长5分米、宽4分米的红色彩纸制作底和高都是10厘米三角形小红旗，最多可以做多少面这样的小红旗？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<gadget id="calculator">10 / 50</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">50 * 4 * (1/5)</gadget>
<output>40</output>

<result>40</result>