To make 10 ventilation pipes with a mouth circumference of 60 centimeters, and the length of the pipe is 2 meters, how many square meters of iron sheet are needed at least?
要做一种管口周长60厘米的通气管子10根，管子长2米，至少需要铁皮多少平方米？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) * 2 * 10</gadget>
<output>12</output>

<result>12</result>