An isosceles trapezoidal vegetable field has a circumference of 110 meters, an upper base of 22 meters and a lower base of 38 meters. How many meters is each waist?
一块等腰梯形菜地，它的周长是110米，上底长22米，下底是38米，它的每条腰长多少米？
<gadget id="calculator">22 + 38</gadget>
<output>60</output>

<gadget id="calculator">110 - 60</gadget>
<output>50</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<result>25</result>