There is an isosceles triangle with a perimeter of 108 meters and a base of 320 decimeters. How many meters is its waist?
有一个等腰三角形的地，周长是108米，底边是320分米，它的腰长多少米？
<gadget id="calculator">108 * 10</gadget>
<output>1_080</output>

<gadget id="calculator">1_080 - 320</gadget>
<output>760</output>

<gadget id="calculator">760 / 2</gadget>
<output>380</output>

<result>380</result>