The area of a trapezoid is 65 cm2, the upper base is 5 cm, and the height is 10 cm. What is the lower base in cm?
一个梯形的面积是65C㎡，上底是5cm，高是10cm，它的下底是多少cm．
<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">65 * (1/5)</gadget>
<output>13</output>

<gadget id="calculator">13 - 5</gadget>
<output>8</output>

<result>8</result>