The area of a trapezoid is 550 square centimeters. If its lower base is extended by 10 centimeters and the upper base remains the same, its area becomes 650 square centimeters. How tall is this trapezoid in centimeters
一个梯形的面积是550平方厘米，如果把它的下底延长10厘米，上底不变，则它的面积就变成了650平方厘米．这个梯形的高多少厘米
<gadget id="calculator">650 - 550</gadget>
<output>100</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 * (1/5)</gadget>
<output>20</output>

<result>20</result>