How many meters of iron wire are needed for ten square iron rings with a side length of 1.5 decimeters?
十个边长为1.5分米的正方形铁圈，需要多少米的铁丝？
<gadget id="calculator">1.5 * 4 * 10</gadget>
<output>60</output>

<gadget id="calculator">60 / 10</gadget>
<output>6</output>

<result>6</result>