A 1.5-meter-long iron wire forms an isosceles triangle with a waist length of 55 cm. What is the length of the base of this isosceles triangle?
用一根长1.5米的铁丝围成一个腰长为55厘米的等腰三角形，这个等腰三角形的底边长多少厘米？
<gadget id="calculator">1.5 * 100</gadget>
<output>150</output>

<gadget id="calculator">150 - 55 - 55</gadget>
<output>40</output>

<result>40</result>