The upper base of a trapezoid is 5dm, the lower base is 2dm longer than the upper base, and the height is 10dm. What is the area of the trapezoid in dm**2.
一个梯形的上底是5dm，下底比上底多2dm，高是10dm，这个梯形的面积是多少dm**2．
<gadget id="calculator">5 + 5 + 2</gadget>
<output>12</output>

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

<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<result>60</result>