If the sum of two consecutive even numbers is multiplied by their difference, the product is 60, what is the smaller even number?
两个连续偶数的和乘它们的差，积是60，则较小的一个偶数是多少
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">60 - 4</gadget>
<output>56</output>

<gadget id="calculator">2 - 1 - 2 - 1</gadget>
<output>-2</output>

<gadget id="calculator">1 + 2 + 2 + 1 + (-2)</gadget>
<output>4</output>

<gadget id="calculator">56 / 4</gadget>
<output>14</output>

<result>14</result>