The ratio of the part buried in the soil to the exposed part of an electric pole is 4:7, the difference between the two parts is 3 meters, how long is the electric pole?
一根电线杆埋在土里的部分与露在外面的比是4：7，这两部分的差是3米，这根电线杆长多少米．
<gadget id="calculator">7 - 4</gadget>
<output>3</output>

<gadget id="calculator">3 / 3</gadget>
<output>1</output>

<gadget id="calculator">7 + 4</gadget>
<output>11</output>

<gadget id="calculator">1 * 11</gadget>
<output>11</output>

<result>11</result>