Use a 100 cm long iron wire to form 3 equilateral triangles with sides 10 cm long, how many centimeters of iron wire are left?
用一根长100厘米的铁丝，围成3个边长都是10厘米的正三角形，还剩下多少厘米的铁丝？
<gadget id="calculator">10 * 3 * 3</gadget>
<output>90</output>

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

<result>10</result>