A 1-meter iron wire is used to form two equilateral triangles with side lengths of 15 cm. How much of this wire is left?
用一根1米的铁丝围成2个边长都是15厘米的正三角形，这根铁丝还剩下多少？
<gadget id="calculator">1 * 100</gadget>
<output>100</output>

<gadget id="calculator">15 * 3 * 2</gadget>
<output>90</output>

<gadget id="calculator">100 - 90</gadget>
<output>10</output>

<result>10</result>