If a piece of rectangular paper is 20 decimeters long and 8 decimeters wide, if it is cut into a right-angled triangle flag whose right-angled side is 4 decimeters, how many sides can it be cut in total?
一张长方形纸长20分米，宽8分米，裁成一种直角边都是4分米的直角三角形小旗，一共可以裁多少面？
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>