How many centimeters of iron wire are needed to make 3 square wire frames with a side length of 5 cm?
做3个边长是5厘米的正方形铁丝框，一共需要多少厘米的铁丝．
<gadget id="calculator">5 * 4 * 3</gadget>
<output>60</output>

<result>60</result>