Cut a piece of colored paper that is 20 decimeters long and 16 decimeters wide into an isosceles triangle flag with a side of 4 decimeters at right angles. How many small flags can you make at most?
把一张长20分米，宽16分米的长方形彩纸，剪成直角边是4分米的等腰三角形小旗，最多可以做多少面小旗？
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">5 * 4 * 2</gadget>
<output>40</output>

<result>40</result>