The height of a trapezoid is 10cm, the area of this trapezoid is 150cm**2, what is the sum of the upper and lower bases of the trapezoid in cm.
一个梯形的高为10cm，这个梯形的面积为150cm**2，梯形的上底与下底的和是多少cm．
<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 * (1/5)</gadget>
<output>30</output>

<result>30</result>