A certain factory received a task to produce a batch of triangular colorful flags. The specifications of the colored flags are 28cm at the bottom and 25cm high. If a manufacturer uses a piece of cloth with a length of 5 meters and a width of 2 meters to make colorful flags, how many sides can it produce at most?
某家工厂接到任务，要生产一批三角形的彩旗，彩旗的规格是底边28cm，高25cm．如果厂家用一匹长5米、宽2米的布来制作彩旗，最多可生产出多少面？
<gadget id="calculator">500 / 25</gadget>
<output>20</output>

<gadget id="calculator">20 * 7 * 2</gadget>
<output>280</output>

<result>280</result>